Personally, I think the whole coach in waiting thing is dumb. Unless Urban retires in 2 years, Day is gone.
Strictly hypothetical (don't down vote me to oblivion, lol), what if Harbaugh gets canned Day is offered and accepted the UM head coaching job?
Would he find success there?
Would you fear him?
Personally, if I were him, I would rather take the USC job.