This is a stupid article. There will ALWAYS be enough young, tough men to play the game. This is an exercise in culling the herd early, to prevent injury to kids who would normally have no business playing football anyways.
There’s no guarantee of having enough people, most importantly there’s no guarantee of having enough of the TOP athletes. Look what’s happened to baseball, kids aren’t playing it as kids so they aren’t playing it as adults either, it’s the reason for the big Latin invasion. In spite of all their efforts the NFL still isn’t big internationally, if they lose the kids they don’t have replacements lined up, the talent pool drops in both size and quality.