Would have to think hard on this one. Thomas and Bradley are inferior players to Wall, but together are probably more valuable than Wall alone.
I doubt this offer moves the needle much for the Wizards, though. Bradley and Beal are sort of redundant and couldn't play together all that much. This trade would likely make them a little bit worse than they already are, and it doesn't give them anything as far as assets to try and build their team for the future.