BBD will have a long, productive NBA career, barring injury.
He's an excellent post defender, he can put the ball on the floor, pass, shoot the midrange jumper, and above all rebound at both ends.
He needs to learn how to get his shot off in traffic. He does a nice job using his bulk to carve out space while rebounding, but he hasn't learned to use his bulk to get a clean look at the basket. He also needs to work on upfakes and maybe a fallway jumper.
His weight is a red herring. His bulk is an asset, not a liability, with the caveat that it makes him more prone to injury, especially knee injuries.