I saw some article speculating that he'd be the guy at Colorado. Neither they, nor ASU, nor Nebraska seems to have shown any public interest, at least not that I've seen. Nebraska was all in on Matt Rhule from the get go.
That said, Bronco would be an enormous pain in the neck if he ended up at Stanford. Even worse (for BYU, not Bronco), it's the type of institution at which I could see him thriving if he got the right recruiting personnel around him.
Purely for the good of BYU, here's hoping Stanford will woke itself out of considering a somewhat odd, overtly religious, culturally conservative dude. Send Bronco to a service academy, preferably on the east coast, or let him hang out on the ranch in Montana.