This would have a lot of benefits such as allowing global trade, massive amounts of money can be moved in seconds and the security is entrusted upon a ledger that is globally spread. However - I feel governments don’t want to give control up
You are answering your own question, I really think that cryptocurrencies in general will be accepted all over the world in the next decades but despite the effects of the monetary policy of governments on the economy of the world, effects that are becoming more visible every day, they are not going to give up the right to print their own currency.Why would they do it, even if in the future cryptocurrencies are so common that people use them more than fiat governments are not going to stop they love fiat and I have no doubts that when they realize people are no longer falling in their scam they will probably try to ban cryptocurrencies and arrest all of those that deal with them, but by then it will be too late and people are not going to be intimidated by those measures.