Weird, I swear we had a thread on this but search doesn't turn up anything. I distinctly remember giving input on this exact subject. Did I talk to someone about it on AIM or something?
Duh, in a
comic discussion thread.
Anyway my take is more or less still the same - there doesn't seem to be a lot that implies he isn't or couldn't be, it seems appropriate that his own plan and his own megalomania would lead to his demise, and I'm not sure if it would make for a good story turn if he popped up again after Chaos is defeated.