Paper money will of course exist in the future. And that is just impossible to happen that it will disappear.
Bitcoin is of course more used in the future and that is good. But many people also need their paper money.
Well if you look at some futuristic movies theres no paper money there and thats where we are heading right now.
We are evolving to a digital world you might not agree with me but in reality thats were we are heading.