Mark Stoops makes quite a bit making/selling his bourbon in KY. Not to mention, he has very little pressure to win there, because Kentucky has traditionally been pretty bad in football. Kentucky fans are happy with 7 wins a year. I don't see Bob coming, either. Taylor has bigger fish to fry right now, trying to win Super Bowls. Of all the guys that I've seen mentioned, the least likely is Fickell; he's not leaving Ohio, period. That said, I agree that it doesn't hurt to ask.
My list is as follows:
Urban Meyer
Matt Rhule
Bill O'Brien
Tom Herman
Matt Campbell
Troy Calhoun
Jamey Chadwell
Hugh Freeze (highly doubtful we'll even reach out to him)
Brett Bielema
Kyle Whittingham
Chris Klieman
Dan Mullen
Kendall Briles
Mark Stoops
Bob Stoops
Ed Orgeron (I personally wouldn't want him as HC, but possibly DC for his recruiting ability)