I don't think Danny is going to make any more moves until after training camp. I wouldn't be surprised if he waits until January when rookies and signed&traded players can be included in deals.
Of course, Ainge will be working and testing lots of possibilities, but after trading Melo, he can just stay pat, so other GMs will need to make good offers if they want our valuable vets (Bass, Lee, Humphries...). I hated to see Fab go, but Ainge put the Celtics in a better position in order to negotiate by trading him for Greene.
As some have posted, when Greene is waived the Cs will be able to take an extra player in trades, so it opens more possibilities for Ainge, who can keep an extra roster spot to fill in case further trades open more cap space(i.e. Humphries+Bogans for Boozer would cut 2M from Cs books).
Ainge has an unbalanced roster right now, but he has the chance to take 2-year contracts to accumulate expirings in the summer of 2015, either to trade them at the 2015 deadline or to open cap space in Free Agency. I expect him to get even more assets while setting the Cs for a great 2015 offseason.