I think so! At least, I don't think protesting is going to lead to change. What it does lead to is a group of really pissed off people, and contrary to what a lot of neolib discourse suggests, a group of really pissed off people can get things done.

I find them great for networking and spreading your own ideas. The protestors are there because they want change. It's actually pretty trivial to educate them on what will actually lead to it. They probably will forget about what you've taught them after their single-issue cause gets resolved, though.