I do not believe that Wade can credibly play SF. ...he is a 6'4". If he does that, then the other teams will all adapt and post him up. Sounds like a good way for him to get injured.
...the Heat will also have to play, you know, DEFENSE? While Allen might help on offense, I don't understand how having him as an additional shooting guard really helps that much.
It's the point guard position that's an issue for the Heat - and the Center position.
Lebron is am amazing player - but as it stands, Miller, or Haslem, or Battier, or Chalmers, or whoever, can be left to double him.
I just don't see what it buys them.