Since the activity has been somewhat dead in this forum section lately, I thought I'd go ahead and throw this one out there. As for my opinion, unless Bowser could come up with a plan that's as good as the one he came up with in the first Paper Mario (which is highly unlikely), then no, I don't think he should be the main villain. Personally, I don't really think much of him as a villain, anyway, since all he most does, in a nutshell, is kidnap Princess Peach because of his crush on her. There have been many other villains (such as Grodus and Dimentio, just to name a few) who have proven themselves to be far more cunning, evil, and psychotic than he's ever been, but maybe that's just me.