The only kind of revolution, that you really need in America is a cultural revolution
To prevent misunderstandings: He's saying there will never be a [political/economic] revolution within "American" culture. He's drawing the conclusion, that US-Americans need to do a cultural revolution first to kill and replace their culture. He's saying, this is a prerequisite for a real revolution that would do something about the injustice. And his argument is, that levels of injustice in the US are already so high, that other cultures would long have revolted.
I find this argument quite powerful, but some theories of social change would argue, that this revolutionary cultural process of self education can only really take place in the context of an actual revolution. In fact, Bolsen himself goes to great length explaining the tight grip, that the ruling class has on culture, so it's unclear how he imagines this cultural revolution taking place. Also, movements, that aim to change material circumstances have an effect on culture too. Experiencing the feeling of actual power, that comes with taking part in a (even partly, temporary, limited) successful social movement can boost cultural change and class consciousness. Emphasizing the role of ideology is fine, but I don't think we could really want people to say "No, thank you" to any kind of political action and organizing that isn't totally centered around culture. That would just be going into Frankfurt School levels of "cultural critique only". Which is exactly the kind of controlled opposition that Bolsen criticizes.
Another answer to the argument could emphasize the role, that a catalyst could play in radicalizing others - to stay in the chemical metaphor from the video. Depending on the theory of change, the catalyst could be a vanguard, or unions or grass root movements etc. but most theories have them. Even US culture is not a monolith and in real life, people have different levels of class consciousness.
Though, I have to say, beautifully poetic speech and spot on on many individual points.