Is Haslem really on his way back? If so, there isn't really that many minutes there either.
This whole thing is being blown out of proportion. I doubt he makes a huge difference wherever he goes. I don't see him as a significantly better rebounder than either O'Neal or Haslem (if he indeed comes back). He can hit an open three, but so can a lot of guys on both teams, especially Miami.
Money (less taxes) and PT may be better in Miami, but team unity, less media hype, and the stronger tradition/fanbase lie in Boston.
I guess we will find out tomorrow.