My opinion:
If they didn’t want to be there and they don’t perform, that’s their business and there shouldn’t be any professional repercussions for that.
However, if they choose to perform and then protest at the end of it and do something undignified not only to the Office of the Presidency but to the Rockettes organization, then there definitely should be repercussions. I’ll let the higher-ups decide what those should be. (Depends on how big a spectacle they plan on making)
And insulting to the American people.