I just heard Jed York (owner of the 49'ers) say on NFL Live that his team plans on shutting down concession sales during the anthem. He said there is more to the issue than just the players or team personnel standing or kneeling during the anthem. He basically said that if the teams are expecting the players to stand that they shouldn't be making money during the anthem as well.
Personally, if I were a team owner, I would have my whole team just stay in the locker room during the anthem. That way there is no discussion about who is on the field and who isn't. I'm all for the players being able to speak on the issues of social justice, but I think the time for that is not during the national anthem. Just my .