Well the Big Two-and-a-Half were not able to make good on their promise to win a title this year. The Miami Heat had more star power than Dallas, but it was simply not enough to overcome their lack of depth. That being said, Pat Riley is most likely already looking at ways to improve his team.
As far as adding more quality role players, well, there aren't a lot of options. Miami simply have too much money already invested in LeBron James, Dwayne Wade and Chris Bosh. They can only take on players who are willing to take lower salaries in exchange for having a legitimate shot a winning a title. However, there may be one major play that could solve all their problems.
Enter: Dwight Howard
The writing is already on the wall. Howard has said that he wishes to remain with the Orlando Magic, but he has also said that he wants to win championships. In a perfect world, the Magic would win it all next year and Howard would sign a five-year extension and finish his career as one of the Magic's all-time greats. However, it is highly unlikely that Orlando will win a championship anytime soon. Howard will undoubtedly realize this and go elsewhere in hopes of achieving his ultimate goal.
Miami could not afford to absorb Howard's contract without shedding themselves of one of their current stars, and Bosh is clearly the one to trade. He is one of the best power forwards in the league, but was unable to provide the Heat with a legitimate post presence. Howard would solve that problem in an instant.
Playing with two extremely gifted offensive players in James and Wade would also allow Howard to focus on what he does best: Play defense and rebound. He would live off of wide open dunks and offensive put backs because of all the attention James and Wade receive from opposing defenses.
You might wonder why the Magic would ever agree with this deal, but the answer is quite simple. It's their best possible option. Unless they can dramatically improve their team this offseason (highly unlikely given the impending lockout), Howard will leave.
Chris Bosh will not be able to fill Howard's shoes, but a perennial All-Star PF is a lot better than a large trade exception. Just ask Cleveland and Toronto.