The future of real money is digital currencies. In our contemporary world, people prefer convenience hence the use of paper money is gradually fading out of the system because it is very cumbersome to carry huge sums of paper money along. Cryptocurrency will then take the lead of the digital currencies because it offers tremendous advantages over the other forms of digital currencies in terms of speed, security, transaction costs etc.
I agree with your opinion. Paper money will disappear and be replaced by digital money.