Mr. Laser Beam wrote:
Since Quinto was so excited about playing Spock in the first place (IIRC he said he was born to play Spock and lobbied heavily to get the role), I don't see him giving it up.
I think it's more likely that any hint of his quitting is just a negotiating tactic for a raise. He seemed way too excited about landing the role to ever give it up. Especially since he seems to have no trouble getting other work in between films.