As much as we would all love to see George in a feature length movie, he has stated that he's committed to CSI until at least the end of season 10. He seems to know where his regular pay cheque comes from and after the oops of being late at the beginning of season 5 he's probably more than happy to stay put
He did talk in one of the Monaco interviews about wanting to buy a script that he can produce. Maybe that's where we'll seen him after CSI. Staring in his own movie that he produced
I think most producers still see him as a pretty boy and can't see past that. Producers need to look past that and see that he's a excellent actor as well as a good looking dude from Texas.