I hear rumors that Russia is considering starting their own national cryptocurrency. As well, many believe that if the US or any other major power ever "adopted" cryptocurrency they would just start their own blockchain.
Foolishness.
Do you know what that would be inviting? Total economic and digital war. If the entire value of the U.S. Dollar is on an open blockchain that anyone can mine and attack, you better believe that rogue/rival nations will do everything they can to try to damage our blockchain. And wouldn't we be forced to levy the same attacks & threats vs. them?
You know who doesn't have to worry about this nonsense? A blockchain of value that represents the entire human race and not just one entity. A true global currency. Bitcoin, Monero, and other truly neutral and worldwide projects don't fly a flag. They stand for all of us. Just look at some of the full nodes running in these projects: there are nodes in China, the US, Russia, India, and many more.
A cryptocurrency flying a national banner is about as useful as an internet flying a national banner (ahem, North Korea). I can see how there might be secure blockchains for internal Department of Defense usage and Apple Inc usage (just like intranets) but no country is going to back their currency with a proprietary blockchain that paints a big fat target on their ass. If they did, they would just centralize it... and that's not really a blockchain, is it? That's just a shared, private database.
So let's end this argument once and for all. It's either the world wide ledgers or nothing; there won't be national flavors.
Some under developed countries are not accepting this kind of currency I don't think there is something wrong with that we just have to respect them.