I know it probably wouldn't happen, but a trade with Bradley + Amir + whatever pick(s) for a really good big man would have to also accompany a move like this. Bradley and Amir make just over $20,000,000 combined, so they perfectly match Blake Griffin, Marc Gasol, Hassan Whiteside, Brook Lopez (ugh) or you could do just Bradley and a pick for Vucevic or something. But you'd want to move Bradley while he's averaging a ton of points and is about to be due for a contract. If we want a super team, we don't want to be paying Avery $20 million in a couple years. Crowder is just too cheap and he and Butler were teammates anyways.
So yes I would be okay for it IF it were part of a larger plan like Ray Allen was. As a stand alone move, no.