Firstly, in terms of economic integration, this is very difficult now because each country has its own face value and money, it is difficult to synchronize, another difficulty is that the legal is unclear because each country has one private law.
This type of problem does not make everybody answer what that country's decision is. You can never get back to the decision of the government unless citizens make their moves.
Secondly, the political, military, and information technology are uneven, leading to access to electronic money is not virtual reality. So how to solve this problem?
The political, military does not answer to this. In US, they are protecting dollar as the national currency that is used in the world. It is the power of dollar. But, bitcoin, who owns bitcoin? None. If there is, an anonymous person.