I've actually thought about this before, and here's what I've decided.
Much like Duvall said, there are many more people, so the true artists are like needles in a haystack.
BUT, more importantly, "entertainment" has changed to suit our ever-shrinking attention spans and bulging wallets.
Music is no longer about music, it's about image. I was trying to explain this to my dad, who actually said, "If Opeth is so good, how come they're not famous? Chopin and Beethoven were famous in their day." Back then people were forced to listen to what little music was available. And the only ones writing were the fanatical geniuses. Now, anyone with a nice ass and a few dance moves can make a record.
So in addition to there being more people in the world, the entertainment industry is glutted with untalented people, which makes it even harder to stand out.
AND, this saturation also has the effect of reducing our collective intelligence, if I may say so. Just as trends change every week, people instantly write off music if they can't immediately "get" it. No one has the patience to analyze the music, which is where the true genius of past composers lies.
There was this autistic guy at one of my piano camps who would sit in the back of a seminar, no piano in sight, and compose page after page after page of Romantic-era music. He was definitely as talented, if not more, than Rachmaninov. We'd go to a practice room after class, and he'd perform what he'd just written in his head. It was unbelievable. Nevermind writing it, I wouldn't even have been able to PLAY it without weeks of practicing first.
This kind of talent does exist today, but no one's paying attention.
And I don't agree with the other posts, that true talent of our day will be remembered after we're all dead. How will future generations remember an artist if we don't even know he exists? In 100 years, who will be representative of our time? The Beatles, that's who. Whoever got the most attention.
I truly believe Mikael Akerfeldt is a genius in the vein of the classical greats. A shame that he will go unnoticed.