Ferentz won't happen if they don't even try.
LSU had just extended a similary sweetheart deal to Saban.
However, Wayne Huzienga was committed to getting the best possible guy to return his franchise to glory, so he agrressively convinced Saban to leave LSU.
There's no guarantee, but I believe Ferentz could have the same inpact for the Bills. He's young, energenic, a good teacher and has been successful at running a major college program.