I agree that Narduzzi gets a head coaching gig after this season - his stock can't get any higher. But why do you (and, it seems, a lot of other people) see Narduzzi only being able to get a mid-tier job? He has built the best defense in the country using a bunch of three-star recruits. It's tough to imagine a coordinator with a better resume. If I were the AD of a school with a potential top team with a coaching vacancy (Nebraska? West Virginia?) I would certainly take a hard look at Narduzzi. I would think that something like Rutgers/Illinois/Virginia would be his floor.
FWIW, he's originally from Connecticut and has spent his entire coaching career either on the East Coast or in the Midwest.