Don't hurt your pretty head with all this thinking, Chris!
Do we normally know when an actor's just been offered a role? Because it seems odd that we know that Chris Evans has been offered Captain America but not that he's accepted it. If he turns it down, won't that cast a pallor over whoever takes it up next? And we all know I want that someone to be Mike Vogel (and I'm not alone! Vogel beat Evans in that impromptu poll I posted on this very subject, 43 to 25%). But lord knows I have nothing against seeing Chris Evans don more spandex in my lifetime, so I ain't gonna complain if he does take the role.
So Chris, you should just relax...