The main reason is that nobody (main economies) wants to become the new world currency. That is a express way to destroy the country industry and local production.
Become the nation with the global currency is only attractive for the countries that already are a finance hub and their entire economy is based on finance services, but contradictorily, they don't have the economic power to convert their coin in the global currency.
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You are right. A line that is walked by the global currency is one of focus upon ones country versus the world.