Apples and oranges. The Bills benefited by playing in a weak conference. Lebron James is the best player in the league and DWade maybe 2nd or 3rd. LBJ has the choice whether he wants to improve the faults in his game and lead his team.
Apples and oranges in my opinion. They will continue to lose if they do not fill out the bench and/or find a strong center. There's only four teams in NBA history to win a championship without a strong center. They also have the fundamental problem of having to shooting guards who are use to being the star. It'll take awhile before they learn how to instinctively share the ball efficiently. They tried and it didn't work. They also face some real issues. The Mavs are just better than them. The Bulls will become better than them. They're lucky the Celtics aren't as young as they were even a couple of years ago.
but honestly i think the heat will win a championship or two sooner or later, i don't think they will make the finals several times, they have some very tough competition in the East with the Celtics and Bulls, maybe even the knicks because they match up well with the heat