I voted no. I don't believe it's impossible, but I don't think it's going to happen.
What we need, in my opinion, to repeat that success is a top, top coach like Saban, Meyer, or Harbaugh. It's not a knock on Riley, but those three guys are media and recruiting machines as well as good CEO/coaches. Lots of players would come to Nebraska to play for Saban, or Meyer, or Harbaugh. Anybody not from Alabama that would go to Tuscaloosa isn't picking a school based on location.
Alabama struck gold landing Saban. Meyer is from Ohio and OSU has a ton of recruiting advantages, and Harbaugh attended Michigan (and the jury's still out on Harbaugh at UM anyway). Unless NU can hit the jackpot and pay through the nose for the next Saban, which we won't, then it's up to somebody like Scott Frost to a) become a great HC, and b) want to come back here.
The other way to do it is to have a staff stay together for a couple decades with a HC that emerges as one of the better OCs and HCs of all time. Just doesn't seem likely these days.