If not GERG, then who?

With the growing consensus around the Board that GERG is a big part of the problem in terms of our defense getting better and improving within the season--let alone within games, the question I have is this: if GERG gets handed his walking papers, who would be the most likely candidate to replace him?  Across the landscape of college ball are there any defensive co-ordiantors who have successfully built killer defenses who might be available.  This is an honest question on my part.  This gets beyond my level of geek arcane knowledge of the game and I think it might be fun to start wistfully looking for greener pastures...