You have to take into consideration that kids are influenced by their parents and their parents are the ones footing the bills. IF the parents of kids refuse to let the kid go to early college or discourage them (my experience), not much will happen no matter how good the opportunities.
As for the schools, the schools refuse to let students do better or be seen as better, so realistically, to be able to take college courses early and not have a school undermine that then dropping out would be good, but realistically it looks bad on the permanent record.
There are high school students now who take college courses at the same time, which looks good on a student’s record.
But, there are valid reasons not to send a younger person to college. For example, some of the subject matter could be inappropriate. I felt safe putting my son into math courses but not the other courses. The parents should make that decision.