Do you think that if we adopted a new national anthem with different lyrics the protests would stop?
I posit it has nothing to do with the lyrics.
We have a changed national anthem with different (less) lyrics. His protest - if you believe him (which I do) - is about police brutality and inequality in the justice system in how black men are treated. The point of the history of the anthem is not that changing it changes the protest - it's that the reverence, history, and import some place in the anthem in order to conclude these players are 'assholes', 'disrespectful', 'spitting on the military', or any of that shit is tragically misplaced. Just because you see a symbol one way doesn't mean those with a different perspective, background, or ideology are obligated to see it the same way.