I feel a bit calmer the morning after, but it's clear this isn't our year. The greatness of Allen is masking an otherwise average (at best) team, coach, and GM. You can point to a few very good Bills players other than Allen, but every team has a few of those. It's a tribute to their quarterback that they have a real shot at the playoffs given the mediocrity that surrounds him.
Would this exact team be Super Bowl quality if it had two excellent coordinators and head coach? It would help (a lot), but I don't think it would be enough, not with this roster. They would also need two or three more difference makers in addition to Allen and Cook.
The recipe: A new coach (you simply have to pull the plug at this point; his time has passed), two much better coordinators, TWO (not one) elite receivers, an elite linebacker, and an elite pass rusher. Transition to the younger, faster players already on the roster. Trade the players who can't stay healthy, are too expensive, or who are about to hit the wall (Bernard, Kincaid, Dawkins, Knox, Dequan) in order to move up in the draft and free up cap space for free agents. And of course cut the deadwood: Milano, Poyer, White, Taron, Rapp, Samuel).
It would require a bold GM to pull all this off, but it can be done. We're four players and a head coach away from the Super Bowl.