Perhaps we need to look at capitalism, not as an economic, political or social system - but as a Religion with a capital "R." No matter what god people worship, what faith they profess, in their church, temple or mosque for one day a week, it is the Religion of Capitalism they follow every day in their daily lives. It is only faith in the Market, worship of money and possessions, and a morality based on greed, which keeps capitalism alive. If that faith can be questioned, we may be on the road to ending the rule of the Religion of Capitalism.
How do we do that on a large enough scale, worldwide? That is the part I find hard to imagine.