Now that Bas has left Pride, I think the UFC would be VERY smart to try and sign him as a commentator. The guy is hilarious, he's personable, he's knowledgable about the sport and I think he would connect with US audiences in a big way. He trains some top fighters, and I think is well respected by the fighting community.
I'm not suggesting getting rid of Joe Rogan...i think he does a good job, but adding Bas would be another shot in the arm for an already growing UFC.