cryptocurrencies could easily go away. They have almost no adoption and the US or EU could look at just how much power and wealth is being controlled by Russia

cryptocurrencies could easily go away. They have almost no adoption and the US or EU could look at just how much power and wealth is being controlled by Russia and China, how they're used for money laundering, or how Iran and so on use them to work around sanctions and just decide to ban them. It would be trivial.