Most likely, all countries will really switch to cryptocurrencies, but not the cryptocurrencies we all want, because many countries are working on creating their own cryptocurrencies. I doubt that, for example, all countries will legalize Bitcoin in the near future, but I believe that this will happen in the longer term. Perhaps in addition to BTC, other cryptocurrencies will be legalized, for example, such as ETH, XRP, XLM, TRX and others.