I don't think it's that simple. Sure, Nebraska was fed up with the Texas favored crap. But that wasn't anything new, Nebraska higher ups had been dealing with that since the inception of the Big 12. What was the final straw that made Nebrask say "....screw this"?
Take that 1 second away, Nebraska wins. Nebraska has a conference title for the first time in a decade. The frustration is subdued a bit for the time being. It's easy to say we still leave, but I think there's a chance we don't had this^ not happened.
You can make a case for NOT firing Solich, but what happens if we don't? A few more years of mediocrity before he gets fired? I don't think there was a big turnaround coming like some think. He had lost control of the direction, his staff and the team. If we were happy with 9 wins a season and a Tom Osborne like guy at the helm, then sure make the case for Frank. But I'm sticking with #4.