There is zero reason to expect Nebraska to ever win another national title. Right now, it looks like the national title is going to rotate between a few SEC powerhouses plus Ohio State and Clemson. When you say "oh but <Program X> will insert itself", Program X has to have a few things going for it to make that a non-nonsensical statement. It has to be in a talent-rich recruiting environment (or able to recruit truly nationally, not "we signed 8 three-stars from the West Coast") and it has to have a winner-takes-all, who-gives-a-fuck attitude towards football. It needs to have a reputation for putting players (especially prominent ones) in the NFL. It needs to be in a P5 conference. After all of that, you can start talking about facilities, the size of the fan base, flashy uniforms, or being on TV. And lastly, as relevant as sprinkles on a donut are to its nutritional content, you can talk about the winning tradition, stuff that happened before HD or ESPN or integrated rosters or WWII or the forward pass.
So, among the programs that have won a least a share of a national title in our approximate lifetimes, here's who's in and here's who's out. In means yeah, you might win one in the next 40 years assuming the sport continues on its current trajectory towards the elimination of amateurism and a full-time, semi-pro NFL prep model. Out means you're not winning one
IN: Alabama, Clemson, Ohio State, LSU, Auburn, Georgia, Texas, Southern Cal, Florida, Florida State, Miami, Oklahoma, Notre Dame (barely), Tennessee (even more barely)
OUT: Nebraska, Michigan, Colorado, Georgia Tech, Pitt (if you're old enough), Washington, Brigham Young, Penn State
I should live another thirty to forty years. Absent a huge change in the structure of college football, and I'm talking about one we don't currently even see coming, I'll be shocked if a school on the OUT list (or not listed at all) wins a national title before I die.