The world is truly becoming more cashless and digital. However, this does not mean at all that states can switch to the use of cryptocurrency. No state will ever allow this, and there are serious reasons for this. A cashless society is only possible in ordinary currency and a digitized national stable coin. Cryptocurrency will be able to occupy a certain niche in the financial sector only along with the circulation of the usual currency of states. It can also interact with the currency of states in various forms, and this process is inevitable and has just begun to develop.
Unless each government creates its own cryptocurrency.
This is the only way that I can see that. If the government creates its own cryptocurrency and they are the ones that are controlling it, it will be favorable for them. The future is leading to digital currencies, nowadays I don't think that the government can still support that. What they are studying now is the development of Blockchain technology which I think is the start since it will really develop a lot of things including the banking systems in a country.