Considering that the vast majority of people comes and goes regularly whether the game is there or not (even more the ones that you don't, rather stupidly, define "fanboys or "white knights" in an poorly veiled attempt to preemptively flame. Since, you know, most people out there don't devote their life only to one game), yes, they are going to come back.
And if they don't come back immediately, they will on the first patch, or the second, or another that piques their curiosity, or the PS3 release, alongside a whole lot of other people.

Most of the people that were interested in quitting, already did.