It's hard to predict what the future will be for the paper money, but I don't think it will disappear very soon, because it's still used by many people.
But you can see that Bitcoin is getting more popular and used, and that's a good sign.
to me prediction about paper money is not so difficult, to me the future of paper money is still bright, and there is not chance of disappearing it. to me it required generation to us bitcoin 100% in their life and ignore fiat currency, therefore the future of bitcoin is still bright.