Money is what the society accepts to be money. Human history has seen so many transformations when it comes to the subject of money.From barter trade to fiat money and now digital currency. But some nations are so rigid to change.well they will all regret soon because no country can stop cryptocurrency.
Transformation of currency is a part of the human society, crypto currencies are one of the transformation that you mentioned. However some countries are trying to regulate this crypto currency just for their own benefit. Nothing can stop crypto and someday every country in the world are free to use crypto and not regulated by some government.