I think the paper money will remain the same as they are because the governments are supporting it but at the same instant bitcoin will also be more popular like other currency because bitcoin is going to be a better currency of the future and everyone is adopting it for their use.
yeah government will always supporting paper money until the world is turning out to be digitalized and it will eventually happening in the future and government think that paper money is not effective anymore so government will stopped supporting it and trying out digital or cashless money
If you go to cut manufacturing costs and work against the counterfeiting of banknotes, then the transition to digital media money will be very fast. So in this regard cryptocurrency will exist constantly.