Feminism

I say it's a "small change" because I think it's a small but vocal group of people who are unwelcoming to people of privilege. (Of course, that's a moronic strategy -- since privilege is power, you want privileged people on your side.) I think it would require the right meme (in the dawkins sense) to get people to call out those who are unwelcoming -- but instead I think the unwelcoming ones had (and still have) the memetic advantage. Privilege = bad is a powerful idea, so you don't see groups of any appreciable size which have this as the winning philosophy. But if the idea were usurped by a more powerful idea -- that could be a small change, just requires someone to think of exactly the right meme.