Their revenue, merchandising, stadium attendance, and TV audience has not been falling at the rate it has in the past 5 weeks however.
I think the NFL is coming up with alternative methods to allow players to protest - something along the lines of armbands, helmet emblems, or colorful cleats. This is a much better path since the message will be visible the entire game and will take the focus away from the anthem controversy & towards the message. It is also something that over 80% of their audience would support.