If, in the future cryptocurrency becomes a major currency in several countries and the fiat currency of that country dissappears, such as USD, EURO, POUND ETC... who/how, will one value a crypto currency against, as there is only other coins to value it?
I don't think it will happen in the future, because in my opinion, it will be going to have a big adjustment to all of us if fiat will disappear, and cryptocurrencies is just our currency, it will make us a hard time to use it and to adjust for all of us especially there are still most of us doesn't know about cryptocurrencies, and they are just relying on fiat. Fiat for me is important because it has a stable value, unlike cryptocurrencies.