Firstly I agree that it was a good move by Rob as simply stated by others, when you're heart isn't it then why stay.
Secondly I am 50/50 on the whole Dan thing. Part of me says yes but part of me also thinks he'll come in for one album, and regardless how good it is then I think old issues will resurface and then that's it - he'll leave (family commitments, etc). Got nothing personal against the man, sure he is a bit eccentric in his nature but I am not sure he is really what the band needs long term - then again I think we might get that `proper' followup to POT after all. Worship Music was half way there in doing that.
I mentioned long term previously and that brings up the question - how many more albums are left in this band seriously? 1 ... maybe 2 possibly. That's not a question of their undoubted talent but rather their knack of consistently pushing shit uphill throughout their career since the 90s.