bear bryant left Texas A&M for the Crimson Tide precisely because "momma called". his ties and dedication to his alma mater were such that he couldn't ignore the request.
barry, however, has spent quite a bit of time with Badgers. i don't know if he'd budge now. and to be honest, he's done a lot for the Wisconsin faithful and i think he's become as beloved there as the Bobfather was here.
... but if it had been earlier... who knows? i read some where (no link, sorry) that barry would quietly say that if the Head Coach job came open at Nebraska, he'd pounce on it like a rottweiler on a pot roast. of course, this was at the late 80s, early 90s... and we all know who was in charge and how unlikely *he* would ever stepdown.
EDIT:
coach barry
the Bobfather
it looks like barry is the Bobfather REBORN!