Maybe we should go back and define "relevant", because I think we have a half dozen definitions being argued.
Relevant to me means that a team is in the mix for deciding a national championship at present. For that to happen, we need to climb back into the Top 25, then work our way up, win the Big Ten Championship, and draw a bowl game that determines who will be national champ, even if it isn't going to be us.
I don't want Nebraska to devolve into Texas, watching clips of Vince Young on Longhorn network, shouting "Scoreboard!" at long gone rival Texas A&M, or still hoping that Notre Dame will come to the Big 12 or the Longhorns can go to the Pac-10. So I put scant premium in what happened in the past as to defining "relevant".
However, that is just my opinion of relevant. If a guy want to say over the past 25 years, that is just as valid a definition as anything I have.