The Magic are the only team with a trade exception big enough to handle some of those contracts. It would be delicious if the TE from the Dwight Howard deal enables Dwight to leave LA.
The Hawks could decide to shift into tank mode if Josh Smith is clearly going to leave. The Mavs could take on the expiring contracts of Bogut and/or Jefferson (and/or Biedrins) if they whiff on Josh Smith and D12 would rather go to Houston if the GS deal doesn't work out.
If I were the Mavs, bringing in Bogut and Jefferson, Barnes or Thompson, and a draft pick would be an interesting situation. If you could re-sign Bogut, Nowitzki, and Marion for less, you could have enough money to bring in a big-contract guy in the summer of 2014, along with enough young assets to have a good supporting cast.
The key is that no one has to take on salary beyond next season, so a deal is very doable.