2020 will be the year when more governments are going to be including blockchain in their systems to become more transparent and more reliable in order to offer a better service to their citizens.
Why is it that you decided that countries should make their national digital currency on a transparent blockchain? In most states, corruption thrives, which is beneficial to the governments. A transparent blockchain will simply not allow corrupt activities.
I think this wont really happen. In fact lot of government in different countries denied accepting bitcoin as a currency because it was s decentralized one which they cant control its value so how you came up with this idea.