He was one boneheaded decision by Erik Ainge away from doing exactly that in 2007.
He was a good coach, and I suspect he still is a good coach. But things had gone stale at UT for whatever reason. It's happened to a lot of good coaches and programs. In his case, I just don't think he was able to rebuild his coaching staff when he lost good people, and when guys like Meyer, Saban and Richt came into the SEC, it started to hurt him.
I hope Phil finds his way back into coaching next year and does great. I'll root for him to win every game, unless he happens to someday meet the Vols in a BCS Championship Game.