Louie C.K.

Everyone already has the power to never watch or listen to Louie C.K.  

If the women he harmed/offended vow to never put one Cent into his pocket, that's their prerogative.  Maybe these women can get other people to engage in doing the same, as an act of solidarity.

Given Louie C.K.'s talent, even if you got 50% of his potential audience to stay-away from his shows, movies, albums etc. he's still going to be very successful.  So denying yourself the pleasure of his entertainment will end up hurting you, more than it hurts him.

I think that what bothers them is that they don't have the power to prevent everyone from going to any show by Louie C.K. again.  The only way to hurt him is if the cancelling is comprehensive, which is not only impossible but also would deny the enjoyment of millions of person-hours of his entertainment.

One million hours of viewing (first run of one HBO comedy special) is 114 years, or more than two human lifetimes, especially if you only count waking hours of life.