The next hire is going to have to thread a very thin needle. First and foremost they have to be a good coach, obviously. But it's going to take some very good PR to keep the fans onboard when/if Frost has to be fired. That's why I don't think anyone with scandals in their past or a flashy "look at me" persona will get chosen.
For example, if we hired Hugh Freeze, a large segment of the fanbase would immediately say "we fired the struggling hometown hero in favor of the guy who got caught paying players and hiring prostitutes, we're now a shady win-at-all-costs program, I'm out." If we hired Lane Kiffin a segment of the fanbase would say "this guy has been a flaky sleaze earlier in his career, I'm out."
I'm not even necessarily arguing in favor of those opinions, but they have to be considered with this next hypothetical hire. The fanbase is going to be some mixture of apathetic, defeated, depressed, and angry if the Frost era goes down in flames. For understandable reasons, he was built up as The Great Last Hope for NU football and the final link to the glory years after two decades of mediocrity and failure. It's obviously hard for people to give up on that, and it will probably be hard for people to get back up off the mat after we have to admit to another failure - the most painful one yet - and reset.
So it's gonna be tough to get it right, and to be honest I am in the camp of people who don't think we are an attractive job anymore. That doesn't mean we just stick with what isn't working, but I do think it means the upper ranks of the coaching world will have zero interest. We have money and facilities and fans, but those two decades of failure are starting to weigh prettyyy heavily at the same time. It's easy to say "we have to hire a proven P5 coach," but if a P5 coach is a proven success I don't know that NU will look like an upgrade to them. That will leave us with mediocre or unsuccessful P5 coaches, hot up and comers from the G5/FCS level, or coordinators. A kinda scary crapshoot.
All that leads me to think our best bet going forward will be with a confident (but drama free) guy with a solid fundamentals-driven system that he knows how to teach like the back of his hand, and for once a willingness to bring in the very best assistants he can find. I genuinely think a lot of NU fans are going to be going through the stages of grief for awhile after this is all said and done, it's gonna feel like it's alllllll over to quite a few people. I don't foresee them get lifted out of the doldrums by a young flavor-of-the-week or anyone who seems shady or inauthentic. I CAN see them starting to regain hope by watching somebody humbly come in and keep their head down and start putting solid fundamentally sound and smart teams on the field. Who is that person? I have absolutely no idea. Could this entire post be full of shit by Thanksgiving weekend? Of course.