They don’t need to ban it. Its dying a slow painful death as it is. Except for maybe the South West, the rest of the States are seeing a huge decline in participation. And they should! By the time these kids are old enough to play football, they’re useless fat slugs who would probably die of a heart attack on the first scrimmage.
Yes, it's going the way of boxing. Can you name the Heavyweight Champ? I can't. I'll bet most serious sports fans can't. Did you ever think that would happen?
Pretty soon, the NFL fade off the same way.