Phil Jackson took over the Bulls from Doug Collins, and won rings. Took over the Lakers, and got them over the hump too. Pat Reilly took over the Heat mid-season & won a title after Van Gundy was forced out. It's worked multiple times in the NHL. Arians took over in Tampa and won with Brady. Just because it didn't work when Ralph acted like a clown doesn't mean it wouldn't ever be a good choice.