Deron to Dallas should happen.
It's a great fit, and gives the Mavs another superstar to build around for the next while.
I see Dirk and Terry sticking around for a few years cause they're both still very good.
(edit - Dirk is still great. He's going to get on fire down the stretch and put all the "he's done" talk in the garbage"
The big key will be D12. If Dallas can make a move for him, watch out.