Then I think our disagreement is how you define "the system". There are many "systems" that people use for a lot of different things. Systems are neutral. They are tools. The only thing that makes them "good" or "bad" is how they're used.
Capitalists have spent enormous amounts of money and a lot of time, turning those systems to their advantage. But, there's nothing "wrong" with us using those same systems for our advantage. They are tools. They are meant to be used.
In the case of democracy, they function based on majority rule...which means that particular system is perfectly suited for the working class to use to our own advantage. We have the majority. That automatically should give us control over democracy. But it only works for us, if we all work together. If we aren't unified, then we can't change anything.
"Revolution" is just what happens when we finally get our shit together, and unify our efforts.