Removing parents from the equation would be a step in the right direction. Amazingly, there was a time when parents seldom bothered to show up for any youth sporting activity that didn't involve a tournament or a playoff. They didn't show up for every game and practice, scrutinize the players in terms of tactics, or debate the coaches. Parents who did do that sort of thing were considered nuts, not "involved".
Children themselves were not thrilled when their parents did hang around for practice. Bad enough to screw up in front your team and your coach, adding Dad to the mix just caused more anxiety.
All those kids coming up under that system of benign parental neglect (in sports terms) had perfectly normal experiences in sports and almost none of them got sports scholarships or became professional athletes.
Just exactly like right now except we don't have the "normal" part.