Paper money is normal a good pay method but everything is indeed getting more digital and due to that we can say that it will disappear in about 20 years from now without any doubts.
Yes we still have to see what is gonna happen of course but most likely it will slowly disappear over the years that are coming.
I don't think that paper money will be diminished anytime soon. It's true that we are living in a fast-paced and digital world, but technology itself has some flaws and we want to make sure that we have a fallback in case digital currency takes its place in society.