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.
It is really hard to speculate in this early days of cryptocurrency most especially Bitcoin because a lot of countries keeps on adopting and making implementations and just decide to only regulate cryptocurrency such as Bitcoin and Ethereum just like here in my country. Fiat money and Bitcoin has both importance to each and everyone of us because they have different technology and purpose. They also have advantages and disadvantages so depending on our desire and usage we will choose what makes us comfortable and convenient.