Yes, Frazier goes and hire Steve Wilks who is hard-nosed leader of men. Leslie Frazier is a good man but the Bills need a leader who brings toughness to the defense. Frazier brings resilience which is not the same thing as toughness.
I'm not a big fan of Jim Schwartz... his "carry me off the field on your shoulders" stunt was lame.
The problem with Dorsey is that Josh is 100% in his corner so if you get rid of him you alienate the franchise quarterback. That said there has to be a lot of soul-searching and self-scouting on offense. The numbers were better this year but Josh regressed... possibly due to his elbow injury but I think it goes beyond that. Daboll was somehow able to tap into the "good Josh" more than Dorsey was. With all the former OCs on the team (Kromer, Shula, Brady, Boras) it's imperative that they get the offense right. With that many resources the offense has to be improved next year regardless of player personnel.
If the Bills fall sort of the Super Bowl next year, major structural changes must be made.