I would, yes, because I think that there is a window to lock Rondo down at a good price. Physically and mentally, next year ought to be a peak year for him, and given everything he was able to do up until his injury, rehab, trade, and turmoil, reacquiring him would be a shrewd move.
You're hitting on a bigger question, of course. A Cousins trade will not be an isolated event. If we do trade for Cousins, that move will be accompanied by at least two other major veteran acquisitions, and I doubt Rondo would be the biggest of them. What would those be? Jimmy Butler, I'm sure, is the number one target. Paul Milsap would be a compatible front-court mate.