Must say that some countries are very close to it and even already implement national cryptocurrency and the others are too far from it and won't see it happening for a very long time (speaking about decades). At the moment the first country to create its own national cryptocurrency is Venezuela. And I heard yesterday that they have the intention to bind it to Venezuela's national currency - Bolivar. So, sounds very serious. I have no doubt that they will do it soon. Because the president of this country is extremely enthusiastic about the idea of national cryptocurrency because he considers it might help its country's economy growth.