Lets theorycraft a little bit... the goal is to first make a list of characters from all RE games to still be known to be alive, Good and Bad guys, then the probability of that character being in future games. I'll start with what i remember
Chis Redfield Leon Kennedy Ada Wong Claire Redfield Jill Valentine Barry Burton Rebecca ____? Billy Coen Carlos Olivera
Jack Krauser Albert Wesker ( The Rocket missed right) Steve Burnside
Im sure there are others im missing.... the potentially have a ridiculous amount of games with just this list --- XBL - III TEK III Detroit Lions (10-6) 2012 Playoffs!
As for Wesker, the first rocket missed, the second removed his head, and he sank into an active volcano, not to mention Capcom have confirmed him as dead. Now as I've said before they may change their minds and come up with a way to resurrect him, but as things stand, he is currently dead as a dodo.