If Emery is as hard-azz a guy as he's been portrayed, I expect Roy Williams will be on an extremely short leash going forward, if in fact he is even brought back at all.
The beauty of having a new GM is that he has no investment in any of these guys whatsoever. He can cut half the roster if he wants and it will only reflect badly on his predecessor, not him. As long as replaces every guy he cuts with someone better, that's all you can ask for.