I am pretty high on the anti - trade rondo draft board. But this is something I would consider, if at all possible which I just dont see. But you just dont trade a legit center for a guard.
Somewhat bad example but look at the Warriors trading Ellis for Bogut. Bogut, when healthy, has made the Warriors look like legit boarderline contenders. Ellis has kept the Bucks exactly where they have been for quite a few years. If that trade never happens, the Warriors are a borderline playoff team and the Bucks probably could have been fighting for a top 6 seed, maybe even top 4 seed, in the weak East.