The guy is very competitive and he knows that if he plays he probably only has 3-4 seasons left in him.
I would think he would have to go to a team close to reaching the super bowl but need a good QB. Im not sure the 49ers are going to go after an injured QB right after Alex Smith starting showing some real signs of being good. SF's problem is that Davis is their best WR, they need a playmaker at WR to get to to the next level, Im not sure Smith is their problem.
Im trying to think of teams that simply need a QB are the Jets, Cardinals Redskins, Dolphins, Rams (maybe), Seahawks, and Minnesota. To me, only the Jets and Cardinals have the potential to be a playoff contender - Cardinals would be a nice landing spot, good WR's, underrated defense, easy division.