I hate MC but he's not dumb enough to go to the NFL.
College is more money, waaaaaay more job security, way fewer drama queens, and you're not coaching players who make more money than you with matching egos. There was a rash of college coaches going to the pros in the 90s and more often than not it doesn't work. Guys like Saban, Spurrier, etc. found out that pro and college ball are so different that you could probably call them different sports entirely.
At a P5 school the head coach is the president and CEO of the entire program and as long as you aren't out getting hammered in public or crashing your motorcycle with your mistress on the back you don't really have anyone to answer to. You've got complete and total control from top to bottom. If your star NFL player wants to show up to meetings late and start shit during practice what are you going to do? He makes 10 times the money you do and he knows it.
In the NFL you have megalomaniacal owners, GMs, and players to deal with, and if you don't shit Tiffany cuff links from day one you're going to get a one-way bus ticket out of town. I'd argue that in the NFL, the head coach has a much lesser role in the outcome of wins and losses, but they're also the first ones to get fired. The guys who have a ton of sustained success in the pros are ones who came up through that system generally. The two different games don't translate.