Mixed Martial Arts (UFC style fights) were BANNED in most states until 2005 when $$$ started to flow. The state of New York still has not passed legislation allowing UFC there, which is why MSG hasn't hosted one yet. They do, however, forsee this coming.
Sports can indeed be banned. We're talking liberals here. They've banned salt, lemonade stands and baggy pants. They'll find a way.
Football will die a slow death. First Pop Warner leagues will disappear and flag football won't be a game that is offered by the local Y. Suburban parents won't let their kids play. Then middle schools won't offer it. Then high schools in the Northeast will stop offering it and other areas of the country will follow.
It's dangerous for kids. There's no denying that and we're only a couple of juicy news stories away from seeing PTA's call for it to be banned. There was a time when high school boxing teams were common. And college. Now they simply don't exist.
As time goes on, football for minors will become like boxing.... and club sport enjoyed by very few. Municipalities will ban the any kind of football contest that charges admission or advertises. Eventually they'll treat unsanctioned full contact football games as simple battery charges - just like they would with boxing now.
It's patently stupid to think that football's death is somehow related to political leanings.