I don't get it..
If Smart proves to be good enough to replace Rondo, why would we trade either players? Wouldn't that want to bring in some disgruntled Allstars who would love to join a duo of Smart/Rondo? Plenty of minutes can be given to both players, and Smart has shown that he can play extremely well off ball. He doesn't always need the ball in his hands, and in an USA interview where he was playing with future possible superstars in Payton, Okafor, Gordon, Randle, etc. He said that his main job is to give it his all, on both sides of the court.
I believe Smart will definitely surpass some expectations, but I see that as a plus. That would probably pique Rondo's interest, and Rondo is probably gonna do his best to try to reach out to some players, and hold up a sign, "hey, godly defensive trio in Bradley, Smart, and Rondo. Just looking for a scorer, and a big man. Please contact Danny Ainge at this following number to sign up."