Is revisionism the greatest symptom of this historical defeat of communism when Marxism has become an incredibly marginal doctrine? What could orthodox Marxism mean in a time when, in the West at least, class struggles have become more common around rent, debt, and citizenship than in the sphere of production? When they have become more fragmented and atomized unlike the mass struggles of an era where the organization of the factory system allowed industrial class struggle unionism to become a reality for thousands of people? I think that the crisis we've experienced is far more fundamental than the collapse of the Marxist-Leninism of the Comintern, which was always an unsteady coalition from the start (do we mean the Marxism and Leninism of Zinoviev, Trotsky, Stalin, LukƔcs, or Bordiga?) and quickly fragmented into multiple factions after World War II. We are now back to the very basic issues of socialism itself as something that emerged as a mass movement from democratic revolutions. We're at the question of how we can even have mass politics in a world that has been designed from top to bottom to prevent or recuperate them.
I agree with your objections to the state of "actually existing socialism" in the 21st century, it poses no ready made alternative to us, but at the same time the Marxist tradition itself is now a dinosaur. If we were to make the contributions of Marx or Lenin to history a living reality for ourselves, I think we need to work past this baggage and think originally about the concrete conditions of our concrete conjuncture and develop concepts to meet the needs of the moment. This doesn't have to mean reformism (imo, the more appropriate target of criticism when people criticize revision in general) and I think it's in fact essential for demonstrating the strategic emptiness and deluded utopianism of reformism today. You are right that people need to focus on the realities of the world around them, but I think today this means starting all over again. We are constructing the communist movement from the ground up, and we're going to have to start from the various partial and democratic struggles today (immigrant rights, police/prison abolition, indigenism, feminism, queer politics, etc) if we want to ever reach the point of a politically independent proletariat and communist party.