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.
one of those hard to say questions; thats only 5 years away. I think lots of places will definitely take crypto by then, and moreso depending on your country. However, i find it unlikely that you'd run the risk of being laughed at for paying with cash... not in the next 5 years for sure.