I think Walton would be a clear step back, and if we get a Mark Jackson or Jason Kidd type then god help us.
But we might as well start talking about this because the writing is clearly on the wall. I think the only thing to do would be to hire a coveted assistant or college coach.
It seems to be working out well (Stevens, Synder, Nurse, Atkinson, Budenholzer), though there are a few stinkers so it's a risk (Donovan, Hoiberg). The list of proven coaches there right now is so unappealing.
My personal choices are Larranaga from BOS and Udoka from SA.