It wont matter anyway. The broadcast networks will simply stop showing the anthem like they did for the Eagles / Panthers game...
The NFL will support that move. The networks will love it and the players will be protesting to just the ticket holders. They still get to protest just to a much smaller audience.
Its a win-win-win. No one can complain about it.
CBS Does Not Air Anthem Protests But TNF Ratings Nevertheless Slide from Last Week - Breitbart