The article is In$ider, but I'll share a snippet I found particularly interesting (emphasis below is the money quote--suck it, Horn Brain). Mack is talking about when he'll retire.
"Bill [Snyder] obviously missed it tremendously. You take a guy like a Barry Alvarez. He has made a smooth transition to being an athletic director. Rich Brooks is 69. Mike Bellotti is more my age. I'm 58. Coaches are great resources. I talk to Lloyd Carr all the time. He says to make sure that you coach as long as you want to, and that you don't quit early because it's never the same after you quit. I feel like I've gotten great advice.
We've lost two games in two years. We had a tremendous recruiting class this year and it looks like we're going to have one next year. Things are so positive in this program right now. Will and I, unlike some coach-in-waiting situations, get along great. Will is young. He doesn't have to be a coach next year or the next year after that at Texas. He loves being the defensive coordinator and we're paying him like a head coach. We feel like we're in great shape.
People have asked me if I've sat down and talked to Will or (AD) DeLoss (Dodds) or (UT president) Bill Powers or (wife) Sally about the day that I'm gonna quit. I really have not. I know people think that can't be possible. I haven't because I really feel if I start talking about it, it's not fair to the kids or me. I don't want to plan retirement and not do a good job coaching. I think what I will do is continue to coach until the day I feel like it's time for a change for everybody, and then I'll walk in and tell DeLoss and Bill Powers, it's time. But there is no timetable."