He would be a fool to leave and Clemson would be a fool to let him go.
It's funny to me how quickly Clemson fans forgot their history. Prior to Dabo they were mostly a good to pretty good team over the course of their history. Now they act like they absolutely have to be a title contender every single season. It's just not sustainable. With exceedingly few exceptions, any coach who stays at a program long enough will have ebbs and flows.
It's just funny to me that Clemson fans now view themselves as such a program that they could just kick Dabo to the curb and bring in someone else who will absolutely replicate his success.
They would be advised to take a look at Bama. Yeah, they were "slipping" under Saban, going 3 years without a title (gasp!), missing the playoffs one of those years and getting in last year based on name association alone. But Saban still turned over a Ferari to DeBoer. Are they still very good? Yes. But they're not the best team in the SEC and they have some noticeable chinks in their armor.
Reality is, when it comes to the portal, there are more misses than there are hits. Fans have been conditioned to think the portal is the fix-all solution. It's not.
I don't know about him fitting with another college program. Odds are he would not find the success at another program that he has had at Clemson. Very few do. And, no, I agree, he is not a fit AT ALL for the NFL. He's a great college football coach, but greater college coaches than him have tried and failed at the NFL. Almost all of them.