That trade is a no-brainer from a Duke fan's perspective. While it's true that the 76ers might be on the upswing soon, the Celtics are already there. They're a historically great franchise with a great coach and a front office that, through savvy moves, is loaded with assets.
I suspect Philly's asking price for Jah would be higher than Crowder + #16 (in a weak draft), though.