I wonder if it is possible/ feasible to "piggyback" with Europe? I know this is just fanciful thinking, as I suspect it would be very difficult and expensive to decouple from Visa/ MC & Amex, and there are likely a lot of ridiculously wealthy people that in one way or another profit from the current system, so . . . Still a good thought exercise.
MAGA is a virus. The US needs to be ostracized by the global community until they come to their senses, if they ever do come to their senses.