Okay I read too much are really believing that it is bitcoin that will be the main money.
Think again. I think we are better than that.
Bitcoin relies with the internet. Paper money dont. It is still the easy way to transact specially with retail stores and with buying food in vendors outside of our houses or in the streets.
Look, what will happen if suddenly internet collapse? Then you will go back to paper money? Or you will do the old time trading with clothes for food or some gold for food? It will get harder to trade again without it.
The paper money or the conventional fiat also relies more on the internet now. Most of the transactions are don online.
you are right, nowadays everything goes digital, but actually it even allows them to create more money over time and inflation gets bigger