Totally depends on who we're moving up for. Ainge has had a tendency to grab highly rated guys who fall down the board for reasons that can be overcome (See: Gerald Green, Avery Bradley, Jared Sullinger, James Young). If one of the top 6 guys (Towns, Okafor, Muiday, Russell, Prozingas, Winslow) falls to 8 or below I think he'll try to trade up for then regardless of need. But if we're moving up for not one of those guys, it has to be the right for for us. I personally think he'll trade up if it means we can get Johnson or Cauley-Stein because they fit our needs well. Probably give up a little less for WCS.
Ainge is one of the best GMs in the league. He won't trade up just to trade up if he doesn't like the guys available. He won't trade Wallace's contract with a pick to clear cap room unless he really believes they're going to sign a major free agent or two, and he won't trade Sullinger, Olynyk, AB or anyone else CBers don't like for nothing just to get them off the team. If we don't do anything this summer, I'll trust that Ainge felt it wasn't worth what we'd have to give up. That's the benefit of having one of the best front offices in sports