What happens to the value of the dollar if the BRICS expand, develop a new currency and become the dominant forces in the global economy?

What happens to the value of the dollar if the BRICS expand, develop a new currency and become the dominant forces in the global economy?

BRICS Is Expanding: Here’s Why That’s Very Concerning for the US https://www.theorganicprepper.com/brics/

Will a New BRICS Currency Change Anything? Maybe https://mises.org/wire/will-new-brics-currency-change-anything-maybe

What happens to the value of the dollar if the BRICS expand, develop a new currency and become the dominant forces in the global economy?
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