No, it would go to zero, because trust would be lost in the network.
Someone is always left holding the bag. If the USA uses it as a reserve currency, wouldnt others, too? Do you understand where this is going? Trust isnt lost instantaneously.
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If others are holding it then they will also likely be mining it, if only to defend against a 51% attack.
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I guess it depends on how organized the governments are. I guess its not a race for nuclearization, it would be a race for bitcoin mining.
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