Marcusa's the Great Refusal

Art and aesthetics are so important to many members of the frankfort school, not just marcusa. We're living in an advanced version of monopoly capitalism that has co opted all the liberating potential we used to have. Art is one of the only things we have left. Marcusa would say that if the goal is a shifting of class consciousness, you can have the most revolutionary piece of art ever. But if it just hangs there and never inspires any change in people, what has that work of art really done to change things for the better?