Would it no longer be unrealistic to bring The Rock back ?
Seeing as your thread is around the same time as when he really came back, no. It probably wouldn't hold the same shock factor though, having 1) seen it already and 2) seen you just imply you were going to do it. But yeah, I could accept a realistic Rock return in an early-2011 thread.
Well bear in mind that The Rock is only the host for WrestleMania and he probably won't make many appearances until then. You shouldn't really have to worry about whether it's unrealistic or not though.