You should watch the show Mr Robot. In the season 2 it goes full crypto, and there is a way of governments vs Bitcoin. The script predicts what I was predicting myself, and that is, a future in which governments want to control 100% what you do with no possible notions anymore for privacy, except they didn't count with bitcoin delivering financial freedom.
They have a cryptocurrency (developed by E Corp) that is closed source and they control everything and they hate Bitcoin since it bursted their Orwellian dream's bubble.
Whoa.. Mr.Robot seems to be the new fap - material

To the OP, countries have already started to create their own coins but who gives a shit. It will never come close to bitcoin due to obvious reasons. There ain't no shit to worry about.
Currency in every countries are already existing since they have their own economy. They are using traditional currency or the currency of there ancient that can help their daily needs in life.