Can we have a revolution to overthrow the system but then not replace it with communist garbage that's even worse?

The cities they’re hosting.

A revolution means a force of millions, drawn from many different parts of society and organized for an all-out fight to overthrow this system and replace it with a radically different and much better economic and political system, a socialist system, based on meeting the needs of the people and carrying forward the fight for a communist world where there will finally be an end, everywhere, to the exploitation, oppression, and destruction of the environment that is built into this system of capitalism-imperialism.

From their extended declaration.

a whole new framework for the liberation of all oppressed people and the emancipation of all humanity: the new communism.

Hilarious.