As I can remember, there is a country that tried to make their own digital currency. I do not know what really happened but I think that is not released. Countries will be making their own crypto currency since it is the future of money. In the future we can see digital currencies used by almost all of the people in the world not as an asset but as a common currency.
This kind of scenario will seem like it will be the present currency. Countries have different currency, and I believe that we can achieve the national growth for economy if we have the same currency. Because if it happens then the transaction will be muc easier at the same time there is no dominant coin. That is why we should use bitcoin as the worldwide crypto coin.