Good response. Unfortunately, I foresee my free time dwindling, so I probably won't be able to get on here as much; but I've been working all day, so I thought I'd try and post a response before the wife gets home.
Seems like a rather incompatible viewpoint contrasted to "we cannot know things in themselves". Science purports to do just that.
As far as that strain of fatalism goes, it's worse than pedantic Malthusianism. While all life left on earth might be eradicated upon massive solar disturbances of any sort, that doesn't change the value of the now in the now, nor does it alter possibilities of "escape" in some distant future.
Taking history at face value, we've gone from grubbing in the dirt and eating beating hearts to finding other potential earths scattered across the galaxy, in what registers as a relative second in the totality of time. What can we do with another 10k years? Estimates of the death of the sun far exceed that time in the future.
Going back to "value of the now in the now", the pleasure of today and tomorrow as experienced in socialization, education, sipping on some delicious coffee, and enjoying pleasing melodies is hardly negated because the sun is going to explode so far into the future that for comparison we barely understand that far into the past.
Brassier (and Meillassoux, coincidentally) are both concerned with the current state of philosophy, which they perceive as stagnant and mired in Kantian models of perception and knowledge. Value reduces, for Kant, to what knowledge (through consciousness and sensation) we can derive from the world, and this knowledge is necessarily limited. Brassier and Meillassoux are both interested in challenging that formulation of value, which relies (in large part) on the subject's relation to the world through sensory perception.
Our senses not only are inefficient in dealing with the whole of reality, but they also occasionally deceive us. This reduction of individual value to how we interpret what is around us through our senses troubles Brassier, I think, because we are unable to successfully judge what is around us. Brassier and Meillassoux are both strong proponents of the natural and physical sciences because they provide us with evolving means of assessing reality, whereas the human sensory apparatus remains mired in the same state it was during Kant's time. The retreat into "correlationism" (i.e. that all that matters is our perception of the world, or how it correlates to our consciousness) fails in the here and now because it is inadequate to deal with things-in-themselves.
This is consistent with what I find to be the consistent shortcoming of a lot of Continental philosophy and it's derivatives: It's entirely unactionable, or if it happens to be actionable, only in a most negative sort of way. It's useful for maintaining a level of mental balance against "irrational exuberance" over any particular solution, but that's about it. This is not a defense of "meaning" vs nihilism on any sort of transcendent level - I readily submit a defense of meaning of the most "base" sort. I. I create my own meaning, even if it could be construed as purely reactionary/a posteriori. Nihilism has no argument for it's own value.
Seen through the lens of Kantian correlationism, I would submit that any individual meaning ("I") is automatically insufficient and inadequate. This isn't
necessarily the case (i.e. it doesn't have to be that way); but for the time being, it is. Brassier writes:
"Philosophers would do well to desist from issuing any further injunctions about the need to re-establish the meaningfulness of existence, the purposefulness of life, or mend the shattered concord between man and nature. Philosophy should be more than a sop to the pathetic twinge of human self-esteem. Nihilism is not an existential quandary but a speculative opportunity. Thinking has interests that do not coincide with those of the living..."
And here I would recall Nick Land's quote: "Thought is a function of the real, something that matter can do."
Freud's theory of the death drive is unavoidable here; if organisms operate - at a very basic, biological level - according to a principle by which their very origins are rooted in trauma, then perhaps the path an organism takes, whether painful, pleasurable, extended, abbreviated, isolated, or invasive, has less to do with subjective interests and much more to do with processes going down to the cellular level.
We've discussed the notion of consciousness before and how it justifies its own existence and value (to put it briefly); but this assumes a position of enjoyment for enjoyment's sake. We can experience pleasure, and thus have some evolutionary privilege to experience it and not to disallow others from experiencing it.
The presence of consciousness doesn't preclude the possibility that consciousness itself is nothing more than the evolutionary prosthesis, for lack of a better word, of a certain organism (i.e. a human) that accumulates and provides a very complex means to control the energies that it encounters. There is a way, I strongly believe, to think past death, to think past extinction, or to think prior to life itself. Both historic episodes present the same material fact: inorganic matter, which is basically all that "death" is.
The economy of the death-driven organism is terrifying because it presents the possibility of bodies that operate according to principles that do not accord with their consciousnesses. There is a strong argument, in my opinion, for ceasing to look at consciousness for consciousness's sake, and attempting to configure consciousness within a broader (posthuman) schema that speaks for inhuman, inorganic matter.
To wit: If we are to dispense with distinctions between "organic" and "inorganic" or "natural" and ""unnatural", why doesn't this extend to our creations: If we are merely objects within nature, so are our rearrangement of objects. Objects-become-(new)objects. So if the cathedral(new object) is "illusory", so are it's unarranged parts(objects), yet Brassier does not assert this. The distinction is necessary for his argument, but it's incompatible with the whole of the nihilistic position.
Brassier isn't saying that the composite parts that make up a cathedral are "illusory," or that the composed building is illusory; he's saying that the meaning attached to the building is illusory. Objects exist for Brassier, and I'm not sure how you're arriving at the conclusion that they don't, or that Brassier must assert that they don't.
Brassier claims that pure material objects exist - they definitely exist, science tells us they exist. The meanings that we ascribe to those objects do not exist, because - and here's the important part - living things do not exist. Life, as Brassier understands it, is a separate and illusory concept that human subjects ascribe to themselves and certain other objects.
Philosophy of life has grappled with this question for centuries; at our most basic, we are lifeless objects, made up of lifeless components. Even the parameters for what constitutes "life" are sketchy and questionable. Brassier insists that we can recontextualize our bodies as lifeless because, in fact, that is what they primarily are, and what they - or their components - will be for the vast majority of all time. Conscious life is not something special that was bestowed upon us, it is an evolutionary accident that likely serves some biological purpose... but it isn't something that exists for its own sake.