Unless they also build a worldwide banking infrastructure, like the US has in the current inter-bank transfer infra (all centralized through NYC), the availabil

Unless they also build a worldwide banking infrastructure, like the US has in the current inter-bank transfer infra (all centralized through NYC), the availability of a post-dollar currency is not enough. There are already a bunch. There's the euro-dollar, all the big reserve currencies. What's missing is that infra.