The only reason a top named coach would come to Auburn right now is for the money. The SEC West has Saban and Jimbo (who recently would have been considered a top 5 coach), and LSU doesn't seem to be moving out of Auburn's way anytime soon. Oh yeah, and there's Georgia who they have to play every year.
So, for instance if I am to compare Auburn with Clemson, Clemson is like Auburn but without getting beaten up by great teams every year. Honestly it isn't like Gus' Auburn team was that bad this year. They beat Washington, which has been one of the west coast's best teams for several years now. They beat Texas A&M (which put quite a scare in Clemson). The LSU game was close. Really they had one really bad loss, that was the Tennessee one.