Crypto currency seems a bit popular, but I don't think it can replace real money. Their are so many people belongs into poverty that can't even aford to buy a cheap smartphone to start cryptocurrency. They don't even have money for food. Imagine if real money disappear. What will happen to them? They don't even know how to use technology. That is why they need real money for their daily living. And one thing is for sure, real money will never disappear.