At the moment, I don't think a ban on crypts or bitcoin is going to be total (if at all it will come ) , this is because bitcoin is decentralized and distinct countries have started looking for accepting it because it would assist there economy when they invest on it.
Yes there are many countries planning for blockchain technology and their own crypto currency and the first one to officially announce that is Venezuela as their government is planning for crypto named "Petro" and once this will be successfully implemented i believe other countries who are looking to recover heir economy and get rid of debt will adopt same. All they need is more awareness and showcasing the benefit of crypto coin for both the normal civilians and the government as well.
If there will be a new electronic coin that the government will issue and implement, I think there will be a great threat in all cryptocurrencies. Government can manipulate people like having a centralized coin. It is upon the government who will implement the use of crypto coin. If they want to take advantage to their citizen or make that crypto coin to innovate, suppport and develop their economy.