The other wildcard in all of this is Avery Bradley. You have a 21 year old coming up and getting better & better each game. He can already make a quick impact on the defensive side of things.
If this organization truly believes in Bradley, as I think they do, then they won't regret moving Rondo for another all star talent. Obviously, the 21 yr old Bradley still has work to put in. So they may not be ready to trade Rondo just yet, & are just starting to test the waters to see Rondo's value around the league. Once Bradley becomes ready to take over, & they're sure he can do it, then they might pull the trigger on a Rondo trade.