If athletes refuse to stand, they should be brought out after the National Anthem is played. The cancer is spreading.
Would be difficult to control since one could not say for certain whether a player would stand or not. If he wanted to make a statement, he would make sure he made it out there.
I brought up kneeling because I thought it might be seen differently than just sitting. Kneeling can be a sign of many things, respect, humility, submit, yield, etc.
If you thought there were something seriously wrong in the government to the point that it was very corrupt, people were being denied justice, rights were falling left and right, etc., how would you protest that? What I am getting at is, at what point do you (or anyone else) stop paying allegiance to the flag of our country?