My six decades of professional experience is a bit more nuanced. I have seen men and women who have undergraduate degrees from night school or community colleges who have continued with their education and have become excellent doctors or lawyers or hedge fund managers and received commercial and professional accolades and rewards. My conclusion is, therefore, that it all depends -- the person who has the ability to succeed and the desire to do so can succeed regardless of the college or university attended. Without that ability and desire, it doesn't matter what college you attend - you won't make it..
Their is a filtering, however, that takes place. Schools such as the Ivies and Duke tend to get more of those who have the ability and desire to succeed, and who are willing to defer present acceptable rewards for greater longer term rewards.
My college and law school are both generally ranked in the top two or three in the country, and I've practiced law in the major metropolitan centers and with the "best" law firms in the world. The best lawyer I encountered did not go to one of the elite schools, but most of the really good ones I have met, did.
UNL gives a young person as fine an opportunity as any -- depends on the person. If playing in big time football at the college level while still looking to the future as a fully developed citizen are the twin goals, then there is absolutely no reason in the world that a recruit should choose a different university because of any fear that UNL would hinder that success.