Maybe not in the NFL but he's pretty young and the coaching community in the NFL and college is very incestial. I am willing to put some money down on it if you'd like that he'll be coaching for quite a while at some level. I mean, most people didn't think a guy like Rich Rodriguez or Scott Frost would get another HC job... they are /were wrong. People said that Bobby Diaco was done after he was at Nebraska and literally couldn't stop a cold on defense during his time at NU. They were wrong. Remember Ron Zook at IL and what a laughing stock he was? Still coached another decade.
Things end badly for a lot of coaches whether that be as HC's, like Saban in Miami or Matt Ruhl in Carolina - and even more so with positon coaches. Like, it goes WAY bad right? They're bums and worthless to their fan base when their times ended at where they are and as fans we are all a little close to this one and like to use words like "NEVER" and "ASSURE" and that's well and fine, it doesn't make it true. Redemption stories in football are a dime a dozen