I found this expression on the news channel about the crypto currency: "Anyone who will try to buy coffee for cash in 2023, runs the risk of causing laughter from the seller, that he does not use crypto currency."
how do you think, is it realistic? Can a crypto currency replace national money?
I think that it's possible, but it will take more time.
I do believe someday in future bitcoin will change national currency, like you said before, it will change but it will need more time than they thought maybe 10 year later or maybe more but i do not think all nation will apply bitcoin for their currency, because for now there are still banned cryptocurrency.