The only way you're going to see a Nebraska national championship any time soon is to go look it up on Youtube and watch a replay.
Their situation is similar to Tennessee, yes, but even Tennessee has a reasonable chance to return to prominence, being so close to all the talent in the Southeast US. Yes, other teams would have to fall apart, but even Nebraska wouldn't even be benefited by that. Alabama, Auburn, Clemson, Florida, Georgia, and LSU could all implode and southern talent still wouldn't have Nebraska listed in their top 10 choices.