Bosh + Dirk + a good young supporting cast could do something.
Let's say Gerald Green finally gets it together. Let's say we trade with Portland for a Nicolas Batum or Sergio Rodriguez. We strike gold with this year's draft pick. We finally do something worthwhile with our MLE. We get a lot of great pieces around Dirk & Bosh and we've got a damn good shot at it.
But I'm really not all that high on Bosh. LeBron ain't coming here, but Wade or Joe Johnson are slightly more realistic options. If we get Wade & Dirk & the right combination of role players, that's an even better shot.
It's all a pipe dream, but it's the only thing worth being optimistic about in Mavs land.