Re: Changing the roster for Avengers 2?
If Hulk/Banner leaves, it'll be temporary like it always is in the books. Something may happen where trust is broken amongst them, he gets angry at them, says he quits, then comes back later in the movie or leaves at the end of the flick, possibly leaving it open for a new Hulk film then his return in the third.
If the person you're seeing ever asks the question "Who is Stan Lee?", promptly kick their ass to the curb.
Who the **** makes a movie and while planning it is like, "you know what this needs...is some Greg Kinnear."