Isn't that more a function of competition than necessity, though? Players who don't put in that time will be benched or cut from the team.

Regardless, I wouldn't exactly call that a virtue. The team members are dumping intense amounts of time into something (while risking literal brain damage) for a tiny chance at a place on an NFL team. Most of those players will leave the university and spend the rest of their lives not making a cent from their sport.

Not saying it's unreasonable to devote time to your passion, without expectation of monetary reward, and if football happens to be it, that's cool. But a university is a place to educate oneself, and it seems a bit sad to me to spend the majority of one's time there not actually doing that, especially when the actual use of time is unlikely to help much for their future outside of school.