At this very moment, Trevor Lawrence is worth millions of dollars. If the Clemson quarterback were available in the 2019 NFL draft, he could be the No. 1 overall selection.
But he's not.
For players to become NFL-eligible, they must be three years removed from graduating high school. So, after leading Clemson to a national championship as a true freshman, Lawrence still has two years until he meets that criteria.
Technically speaking, Lawrence doesn't have to play college football. The obstacle is that no reasonable alternative exists. The Canadian Football League and Alliance of American Football mirror NFL rules, and the XFL's policy is a work in progress.