Maybe in 30-50 years, but not right now. The first step would be to get rid of physical cash and only use electronic money, the second step would then be to switch from fiat money to crypto currencies. The problem is that already the first step can't be done in a few years and will take probably 15 years. If I look at my grandmother for example, she only uses cash. All the banking and using her cards is done by my uncle, without cash she would be lost. I think that most elderly people can't be forced to stop using cash, and the politicians won't push it as they are afraid to lose the votes. With the second step to switch to cryptos it would be difficult to get all people to adopt them. If I look at my parents, they have heard of bitcoin but never owned any and are quite sceptical to use them.