I think the decline in Nebraska football to mediocrity was inevitable but undoubtedly accelerated by poor administrative decisions. I don't think any one player, not Carl Crawford nor Bubba Starling nor Joe Burrow would have stemmed the inevitable tide of disadvantages Nebraska accrued when college football became a huge money sport.
Bottom line, once college football games started appearing regularly on TV, schools became awash in football money and thus interested in developing their programs by investing in coaching and infrastructure. Schools invested in stadiums, locker rooms, S and C and training tables, coaching, and recruiting. Scholarship limitations and the elimination of partial qualfiers helped diffuse the talent pool. The population began to shift south and our major geographic disadvantage began to create a gulf in talent between Nebraska and the other blue bloods. One only need to look at the sharp decline in NFL talent produced by the program over the last 20 years as evidence. Our revolving door of coaching changes and systems coupled the talent decline with instability. Thus, here we are.