Perhaps one day with the current bitcoin advances, bitcoin digital currencies will be an international currency for all countries, and make it easier for every human to make transactions between countries when going to another country.
if it happens in the future it will certainly affect the paper money that exists around the world, whereas we know when the banknotes have a lot of history and symbolize the diversity of a country with other countries.
if that happens, surely the government will not remain silent on the matter, there will be an agreement between state governments to immediately close the bitcoin network to the world.
what will you do if you have a lot of bitcoin.
They do not have the power to do so, the only way to affect the bitcoin network is by shutting down the whole internet and if governments around the world did that there will be an outcry from a significant portion of the population of the world that are very dependent in it, in fact I do not know if governments could really shut down the internet since that would mean shutting their communication channels as well.