Ancient history that people on this board already know:
The Bills have had three eras of prosperity/winning/playoffs, etc:
--the Saban Years
--the Knox Years
--the Levy Years.
What all these guys had in common (besides an occasionally cooperative front office, although Ralph's FO handling had a lot to do with running off at least two of them) is that they were all former Pro Head Coaches. Ralph also tried that with John Rauch (failure) and Wade Phillips (mixed results, but there were playoffs).
On the other hand, Joel Collier, Kay Stephenson, Hank Bullough, . . . in each case Ralph seemed to think he owed the "interim" guy a shot at a full season.
So if Ralph really makes a change, based on his past pattern I hope it's at season end. But don't kid yourself that Cowher or Gruden would come here; maybe Jim Fassel.
But that means '09 is already a wasted season.