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I see the world transitioning to a USD central bank digital coin for currency and Bitcoin as the store of value in the future

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There will likely be many national currencies, the Digital Yuan comes to mind as a major contender. A global currency increase the risk to larger scale domino effect in the economy.

global economy is much like communicating vessels, large scale domino effect is also possible, having a global currency such as bitcoin disconnected from nation events, is no more riskier than without it.

see China's Evergrande crisis as an example.

Why? What problems would Bitcoin solve?

It can barely keep up with the very few transactions now. Its transaction costs are sky high

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