Nebraska has been snake bit by coaching hires. Look at Michigan. A couple bad hires and you get 15 years of losing.
Yeah, there are only a handful of programs in any sport that can rebound near instantly from a truly bad hire. A bad AD, who is allowed to make multiple hires, can legitimately wreck your program's image for a lifetime. Illini football wasn't amazing or anything in the 1980s, but the stadium (70k+) was packed every week, there was high-level talent and we were learning how to be competitive again ... and then bad hires have turned Illini football into a program most kids don't give a second thought to, lol:
1980s: 63-48 (.568), 5 bowls (1 BCS), 1 Big Ten championship
1990s: 50-63 (.442), 5 bowls (0 BCS), 1 Big Ten championship
2000s: 45-73 (.381), 2 bowls (2 BCS ... lol), 1 Big Ten championship
2010s: 46-78 (.371), 4 bowls (0 BCS), 0 Big Ten championships
Nobody remembers that now (much less the literally legendary names that have played at Illinois, going back to George Halas, Red Grange, Dick Butkus, etc.) because we have been such an after-thought for generations, lol ... but there is literally no reason it should have been that way. Simply a bad AD making bad hires a couple of times in a row. We'll see how "fargone" Nebraska is ... I expect not too much, as their fan support has remained remarkably good.