Let me further clarify. Call me a "vulgar Marxist" - but I firmly believe that if the material base on the ideological superstructure are on a collision course, it is the ideological superstructure that yields. I am not saying that ideological superstructure is not important, it can be important when it sis aligned with the material bases, but it is simply pushed aside when it contradicts the base.
In my mind, marches, demonstrations etc, are working on the ideological superstructure side. It mattered when that superstructure could be aligned with the material base - i.e. the de facto control of the material means by the working class. Without the relation to the material means of production, the concept of class is pretty much meaningless. So when I say that protest mattesr only when it mobilizes working class I mean it matters when it mobilizes people who have the physical - but not necessarily legal - control of the material means of production, and the protest can abolish the superstructure (beliefs, property rights, laws, etc) that prevent them from exercising that physical control in a way that is revolutionary.
The fact of the matter is that today protests cannot have that effect because they cannot lead to the exercise of physical control of the material means in a way described above. All they can do is to define class as identity politics - as people who feel they belong together and have a 'working class" identity without having the physical control of the material means. I d not mind if other people do it - but I simply think it is a total waste of my time. What I would rather do is to organize material resources in a way that undercuts capitalist control of them - eg. by cooperatives and mutuals (which are already strong in Europe, Canada, and many Third World countries) and organizing international coalitions of cooperatives and mutuals, and their political representations. There might be other ways, I am sure, but they need to be on the material bases side not identity politics which again I consider an utter waste of my time.
Wojtek