Rondo's style of play has been predicated on athleticism and speed. A player is never the same after a major injury, so the question becomes, just what type of player will Rondo be when he comes back? If he drops only a smidge in athleticism, speed, etc., he will probably go back to being what he was, but what if he loses more than a smidge? Can he adapt his game to play slower? Will he still have that same level of "value" (a 1/2 type player) or will he fall down a rung or more in "value"?
I have a real concern that the Rondo that comes back is nothing like the Rondo that was lost (not right when he comes back but after he has been back awhile), and I am just not sure he will be able to change his style of play to fit his lesser physical skills (though maybe that will force him to actually learn how to shoot more effectively and efficiently).