A job at USC would certainly position Dan for a national championship. If your making $4M+ a year, Southern California is a really nice place to live (and even raise kids). My theory is that Dan wouldn't take the job because they would not have near the tolerance for his ego as we do is Starkville. I've got to think USC has as many money boys and straphangers from the glory days as UTexas has, making it a toxic environment with little control allocated to the head coach.
Just my theory.
Just my theory.