The USD is never going to disappear until all the other fiats disappear. I think it will take decades before any other possible currency takes its place. We saw the rest of the world go negative but the US did not and that is why there is a lot of confidence in the dollar.
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We will likely reach a post monetary system by then. The USD is probably the last reserve currency we will have.
The financial and economic system in a half century will likely be much different than it is today.
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