UNC could have done a lot worse than Mack Brown. If he puts together a strong coaching staff, then UNC will likely improve and be more competitive in the weak Coastal division. Gene Chizik and Kliff Kingsbury would be very solid hires for UNC. I expect that UNC's football recruiting will also improve. With how weak the Coastal division is, it is not difficult to imagine UNC competing to win their division in a few years.
Chizik sucked at UNC like 2 years ago. Why is it going to be any different now?