Performers as activists

First, go to this old site by great performance artists who want to change the world.
Think about the site, what it says, it is, and the like.
Look at the date. Why does it seem as if nothing later happened? There is a strange feeling I associate with a lot of performance art - it is often strong, seems powerful... but somehow disappears, doesn't have quite the impact it theoretically should. And I'm sometimes affraid it's not because of politics, but because there is just something missing - some dynamics, some gesture which would help us retain whatever is the thing the artist would like us to leave with. This web page seems like a strange symbol of this struggle.