I have a simple resolution.  The owners compel their players to sign a binding document stating that should an individual player decide to take a knee for the national anthem, he is willingly committing to donating half of his salary for that game to a local charity for inner city communities.  If he decides to sit during the national anthem, all of his salary for that game will be donated to said charity.  This will give tangible value to each individual demonstration, and show they truly care more about the welfare of the underprivileged populace than simply showing disrespect to the flag and the country in a voiceless, and somewhat meaningless act of non-conformity.