There's a ton of variables at play here. At least, to me, it's not quite as simple as "trade him" or "don't trade him".
-Does he want to stay in BOS and resign with the Celtics?
-What are the trade offers coming in? Are they still 25 cent or 50 cent on the dollar deals or pretty balanced trade offers?
-If he doesn't want to resign, do we ship him out in a trade for pennies on the dollar just to get something of return or do we simply let him play out the season and let him walk for nothing at the end of the year and take the salary cap savings?
Right now, I'm inclined to keep him because, quite frankly, he's the Celtics best player and I think he can be a piece (not THE piece, but a piece) of a contender. Also, I think the trade offers that have been speculated about have been pure garbage. I'd rather let him walk for nothing than take on some of those crap offers that might tie things up down the road.
If I'm Ainge, I'm working to get him resigned and staying in Boston unless I'm blown away by a trade offer (which I doubt is happening).