Future remains intact of the paper money as worldwide there cannot be one currency. Paper money will not disappear anytime soon, maybe it will be replaced by something else similar to paper. Bitcoin could act as an secondary currency if country adopts it.
If we are talking future of course we are going to see that what is going to happen for that time. And we all know that technology conquers all over the manual and basic requirements on this worlds , processes and for sure in monetary unit. Technology is going to conquer it, so the future of paper money is going to be out.