Heat need cap room to keep their man talent on the roster including LeBronBron. Wade doesn't have the stamina anymore to keep playing the minutes he does so a good off-season will help him, Bosh has tried the ride so far and he's a 'team player', Melo wouldn't create anything in So Beach but a headache for Riley and company and both Melo & BronBron aren't getting any younger, also Wade definitely ain't getting any younger.
With all the mumbo jumbo out of the way - it would not surprise me to see stay in Miami, he has a home away from home in Akron, the team already has decent chemistry and probably learned a lil bit watching how well the Spurs played as a 'team' and how the top players on the Spurs didn't take mega dollars to stick with their team and what a great ride SA has been on the past few years.
Lots of free-agents will be hitting the trail to see what they can get, but we also have to remember, there is a cap on teams in this league so those players seeking a ring or just money will weed themselves out.
BronBron stays in So Beach, Melo goes to Chicago.