The question in my mind is whether the Wade/LeBron experiment implodes before they can bring in the pieces that they're lacking (a decent PG, a legit, defense-and-rebounding 5).
They're lacking in trade assets for these kinds of complementary pieces. Joel Anthony and Haslem don't make quite enough to bring back an MLE-level player by themselves, and why the hell is Anthony signed through 2014-2015 anyway? They gave away virtually all of their 1st round picks in the S&Ts for Bosh and LeBron. They aren't exactly loaded up with young guys who might be attractive trade bait.
So, let's say Miami wanted to bring in a better PG or a better C. Pretty much their only trade assets are Haslem and Mike Miller, both of whom are key bench players for them. Otherwise, it's basically wait until next summer, when they get to spend the MLE again.
So, how does Miami fill these holes on their roster? And, if the team isn't dominating, how long until Wade and LeBron start to chaffe? Bosh will get blamed first, but there's a decent chance we see this whole thing blow up within a year and a half.