Shaq is getting old obviously
Zo may not come back
Payton may not come back
The most important thing the Heat can do is get younger. Just build around Wade since he is just about unstoppable and will be for a looooooooong time.
I think the Heat will have a lot of trouble just because they were so dominant in the paint last year because either Shaq or Zo was in the middle 95+% of the time. If Zo doesn't come back, they can't replace that...