and We can use digital currency for payment online. If we use paper money, we can not do it .
so The digital money just has future.
Even we are living in the world that is now being conquered by technology still there is a future for paper money. All types of currency are just innovating and that's the future of paper money it will be digitized and it's all happening now. Crypto currencies are perfect example for it and as well as paypal's service.
Probably bitcoin and gold is really apropriate for the future.
Both trend value is never decrease.
You are in for a big, big surprise
None other than Alan Greenspan himself, the former chairman of the Fed, said it in the public that gold is currency and no fiat currency such as the US dollar will ever match it. Gold may in fact not be a currency for the masses (though gold bugs will obviously disagree), but it is certainly the money of last resort to governments. Monies come and go but gold remains, and if things massively go haywire on a world scale, governments will start using gold for trading between themselves. And it would well match Bitcoin as a means of transacting in a trustless environment, when governments no longer trust each other
And still less paper money they happen to print