You are the one under a delusion. There are vast amounts of money in dollars flowing around the globe that would have to be replaced. The trading you are talking about is miniscule in comparison. It has been around for years, as you say, and has not gained much traction during that time. There are also Bitcoin and SDRs, and dollars may be replaced one day, but it ain’t going to happen soon.
Nothing has to be replaced. That’s the delusion.