I feel like this thread may be a joke... unless you're comparing him to Adrian Peterson, I don't know how you could possibly expect more. Knee ligament injuries probably ruin careers more than any other... the fact that he's already showing improvement from game to game is encouraging.
Rondo also said in a recent interview he doesn't like change, feels he is already being paid superstar money, and wouldn't mind finishing his career here. How could you go wrong in resigning him? He's worth far more to us, right now, than any one else... and if he does return to his all-star form, he'll be a major asset.