Like many people already said is that the paper money future is not so good because it has the digital word against.
Everything these days will get digital the world is really changing.
You are right, it is very alarming the trend of technology today. Everything can be done through online transactions or by means of computer use.
So the future of paper money is really on it's way to downfall. Because people wants to be more convenient when it comes to monetary unit.
With just a simple click you have already your money online and you don't have to bring your own physical wallet for it.