Oh, OK, I get it. Shatner- no. But dark Kirk? Bring it on! I think Chris Pine could do a great dark version of Kirk, and have Spock and Bones frantically trying to bring him back before it's too late. They didn't go through everything they did to lose him again! And to have Khan thawed out to help them? Yikes! Then will they give him and his people that planet they gave them in TOS? That could work.
So in other words, in three films, you would never get to see a proper Kirk. Part 1 and 2 are all about hotshot Kirk becoming mature, and Part 3 would be about Kirk being bad for most of the film?