Their 2015 picks are the 15th, 26th, 33rd and 45th picks in a 12 player draft, what do you think you're getting for that hot mess? I mean, sure, if the object is to keep running out ten man bench teams then you can can probably move them for more Brandon Bass/Jonas Jerebko type players. But you don't get cornerstone guys for that slop stew. Not unless it's a star player and pending free agent who's telling his current team that he will never re-resign with them and won't re-sign with anyone else except Boston. But Boston has zero path to a title at the moment, so they're not going to get that break.
The future picks' value is more limited due to the high variance, we already saw this last year when Boston attempted to trade for Kevin Love in the run up to the draft. Even with #6 in tow there was no package of picks that Boston could throw together for K-Lo because for all anyone knows Brooklyn would keep eking out #8 seeds.
So, they could throw together a godfather offer to get one guy, but why the hell would he stay to head up a ten man bench? Until they get that first star everything else is going to be stuck, and once they have him they need enough assets left to get that star a surrounding cast.