I may not have the best grip on the English language, but I believe these are contradictory statements. To compare us to Arizona is unfair, as they have suffered less since Warner than we have since Kelly. We will be in all likelihood stuck with EJ or Orton as our starter, week 1. One can hope that EJ can develop more during the off-season.
Nonetheless, cleaning house after our best season in 9 years, where we were in playoff contention, would be idiotic. The only justifiable way to get rid of Marrone, would be if he refused to give up playcalling duties or refused to fire Hackett.
Assuming that they lose to Patriots*, I have to say that Buffalo did well enough to not be considered football purgatory. We upgraded from laughingstock to mediocre. Hopefully, the gains in performance and status continue. However, I believe that the growth is done with a scalpel not with a cleaver.