Countries like the US or GB and certainly China or India will never give up their currencies even in the way that they will add another currency as an alternative - because that would mean they think their currency is not good enough - but I don't think they will prevent other countries to experiment with Bitcoin or any other cryptocurrency. As you say, perhaps this is an opportunity for small nations to become less dependent on others - and if there is little truth in rich countries wanting the progress of less advanced and poor countries, then let them try to do something for themselves.
true, seem that since El Salvador didn't have its own currency the adoption decision might have been somewhat easier. Agree on the point that none of the big countries would willingly undermine their own currency unless they are extremely forwards thinking individuals (which I highly doubt).
I believe China and India are already investigating into an 'official' virtual currency.
if I'm not wrong Japan also legalized bitcoin, but it's still a drop in the ocean.
What Japan and Germany did a few years ago is not the same as what El Salvador did - it's something like
"Bitcoin is legal in our country" compared to
"Bitcoin as a legal tender - which would mean - everyone has to accept it as official currency". More about that can be read
here.
Good shout. Thanks for the ref.