In my opinion it could happen, but for now it seems difficult to realize that, even though the crypto currency offers many conveniences and benefits, but the crypto currency also moves independently, separate from the country's central bank. The virtual currency system works completely closed through the blockchain channel, where crypto users are completely closed. Most countries are also totally tax free and their value cannot be determined by the government. In my own view, it would be very dangerous if the crypto currency replaced the original currency, with prices that could not be determined or were very volatile, would seriously threaten the economy of a country. Cryptocurrency assets are only suitable as investment fields. And if all countries have their own crypto currency, the country should be able to regulate the price, and that is impossible.