Well, by looking at what is happening in different countries, some like Scandinavian ones are testing or considering cryptomoney that could progressively replace paper money, especially Sweden which has one of the highest rate of the population paying by credit card.

However, there are 3 issues that need to be considered: IT security (hacking risks), energy/electricity market evolution (IT and the internet is highly depending on it) and regulation. All 3 are evolving at a different pace in every country and still need to be improved. But developments are ongoing.

When looking at the changes that occured in the music or in the telecommunication industry for example in the last 30 years, I would assume that one day it will happen.