A couple of thoughts.
Really though, many folks see this as a workplace issue. Most cannot protest in their work place.

Kneeling is a better option than those who have chosen to sit on the bench.

Ultimately, it is up to the owners to strike a balance between their customers (the fans) and their employees (the players). Trump, IMO gave it more attention than it is really worth, although, did he do everyone a favor by forcing the conversation to a higher level?