There are a lot of reasons that I don't want to see Rondo traded. I'm not going to get into those now. If there's one thing we all seem to be agree to disagree about it's the relatively worth of Rajon Rondo.
But, to me, the main reason I have a hard time seeing Danny decide to trade Rondo is simply that I don't think he can get away with it. No matter what people think of Rondo, I think it's relatively unanimous that he is currently the team's best player. Ainge has gone on record saying that the team is not going to tank. Unless Danny can get back a player in return who is as good as Rondo right now--which seems highly unlikely, considering that he is recovering from knee surgery--I don't see how trading him away wouldn't absolutely stink of blatant tanking.
Danny can't afford to go down that road. He needs to put together a team that has some semblance of the appearance of being competitive. I mean, he already traded away Pierce and Garnett. That can be justified to some degree in that he got back some assets that will help our long-term future, but if Rondo were the next shoe to drop it would simply be too fishy.
If he were to try to trade him away for draft picks and young, unproven players, or less talented expiring contracts, I'm guessing that the league might even decide to investigate the move as a blatant tank job.
Expect to see Rajon Rondo as a member of the Boston Celtics next season.