I think it is possible that in the future crypto will replace Fiat in many areas such as health care, education ... But to do that I think it is necessary to address the problem of poor status in the world. when they are not able to receive technology.
I have too many doubts concerning these things. Yes, I agree - the cryptocurrency will be used in all spheres of our life. However, traditional money will never vanish. Cash and credit cards are very convenient.
Not card are having value anymore now. I think now all over the world people use only crypto currency. According to history till now the ratio of using fiat or cash / crypto currency is almost 50/ 90 so it means now in our society people are being so aware and they are liking technologies because it made their life easy.