One thing that concerns me about anti-racism/feminism is that people who support them don't seem to have a vision of what success would be like.

This is connected to a more general issue: Institutions and movements very rarely acknowledge when the issue they've dealt with is essentially solved. You see this in other examples as well organizations to prevent animal cruelty would be one example. When an organization goes completely away it is more often because they were on the losing side of political and social discourse (e.g. pro-prohibition groups, anti-miscegenation organizations). The only example I'm aware of where the organizations simply died out after essentially a success is organizations to help deal with polio, and even that still exists in limited forms.