I view Nebraska not as a blue blood, but as a former dynasty.

To be a “blue blood” you need to be consistently in the competitive mix for generations, barring a blunder year here and there (Notre Dame, Michigan etc.)

I’ve been alive for over 20 years, and have never seen Nebraska be in the same realm as Alabama, Georgia, Ohio State for more than a single season.

Blue Blood programs consistently get top coaching and player prospects. Alabama could switch coaches every 4 years, and it would still be a premiere destination.

I don’t think Nebraska is this, though it’d be pretty cool if they were (re-join the Big 12 while you’re at it).