The world is changing very fast and some pople claim that cryptocurrencies will replace fiat money, but i do not think so, this is impossible!
hm you r of those people who sold bitcoin in 2014 for nothing. Everybody admits that this replacement is soon to happen. Our market has a lot of minuses so they can be possibly solved with crypto.
so I ve no idea about the possibility of such replacement but Im supporting the idea of coexisting these currencies. What can prevent it? Nothing