Name some child actors that have crashed as adults. You said most so I expect that you can at least name 4 since I named 3 who have not.
I guess that college is about what you want it to be about. For me, I want it to be about getting a degree so that I can make money. For you, it may be about having fun and enjoying the college experience .
If you look at the #1 rated players how have left early for the NBA, none of them have failed. They are all better off than they would have been if they had went to college. McGrady, Garnett, and Kobe are the only 3 who were rated #1 in the last decade. As for players who are not rated #1, they should consider college because it will help them make more money in the long run. I guarantee you that Lebron will be a huge success too.