This will never happen for countless reasons
Really?
Give me a list of reasons and I'll show you a injective mapping to the natural numbers.
1. Dwight has no interest in going to Miami
2. The Heat will never break up the big 3 after only two years togther, one of which could end without one of them even able to play
3. The Heat would never trade those two players for Dwight when the best offer on the table for the Magic is Brook Lopez. Chris Bosh is much, much better and the Magic know he's the best they could get right now, without Dwyane included.
4. The salaries make no sense unless Hedo Turkoglu gets moved too, do you really think the Heat would trade Chris Bosh and Dwyane Wade for Howard and Turkoglu? That's an absurd deal.
5. The Magic would not trade Dwight to an in-state rival and create the best duo in the NBA since Kobe and Shaq
6. Bosh and Wade would want no part of "rebuilding" with the Magic and would sulk until they were traded elsewhere. They'd be a solid team with those two but nowhere near the favorite to win the championship that they are with the Heat and LeBron
Do I need to continue?