Yes paper money will be good because theirs a law behind its existance and cant never replace to any other crypto or digital money existance and any other of it i dont think crypto currencies my have its own version of paper money becausr it is no country origin while paper money is origanated by country makers and have strong law implemented.
Paper money is much important and won't disappear however the digitalization takes place. Everywhere there will be some people who don't have interest over the digitalization.
You see of course that Bitcoin is getting more used and popular and that is logic because people make it also more acceptable.