The program was already hurt twice because of TO hiring guys who had no HC experience at the D1 level and as a program we are better than that.
There is no evidence that first time head coaches won't be good because of lack of experience, or that experienced head coaches WILL be good because they have head coaching experiences. That doesn't matter. At all.
As for Frost, he's one of the biggest coordinator names in the country and he's gonna get a shot soon. It's not like his offense is exactly terrible this season - not where it was with Mr. Universe Mariota, but it's still pretty solid overall.
Not only that, but he's been exposed to just about everything you could. The only thing missing from his resume is actually having head coaching experience, but like I said, that is no indicator of whether or not you'll be any good. He's studied or been a coach under Bill Walsh, Bill Parcells, Bill Bellichick, Jon Gruden, Tom Osborne, and Chip Kelly, spending time as a Linebackers Coach, Defensive Coordinator, Receivers Coach, Quarterbacks Coach, and Offensive Coordinator, as well as obviously playing quarterback and safety.