Time will indeed answer everything
Indeed time is the best answer. When we talk about paper money, I think we talk about cash particularly (paper and coins). Just open any book about history and observe that people has been using cash money for thousands years. And some people think that digital money or cryptocurrency will replace it in nearest future or during our lives? We all can dream that one day will conquer and explore space, everything will be digitalized. But it looks like that we will destroy each other faster than will have first space colony.
On the other hand today we also have to think about the state of technology. Even though the technology is now quite advanced, this is only happening in a few large areas and there are still many areas that are lagging behind.
Although now there are many accommodations that do make some improvements such as traveling without having to pay with paper money, this only happens in some areas in big cities.
I think paper money for areas that are rarely exposed is still commonplace and this is the most possible thing to do because access to it is hampered if you leave that condition.