since the US Dollar has been the "world's default currency" will there be any effect upon the citizenry of the US when the Yuan becomes a world reserve currency or are concerns and worries unfounded?

After reading, "reading 6-1", (Please find reading 6-1 in the attached document to answer this question). since the US Dollar has been the "world's default currency" will there be any effect upon the citizenry of the US when the Yuan becomes a world reserve currency or are concerns and worries unfounded? Elaborate.
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