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.
Also Because I'm sure that people will always want something that they can hold on to and they can trust too. In Digital Currency they cant hold physically and also not sure its stability, so that why Paper money existence cannot be denied.