Bitcoin. As the first cryptocurrency, Bitcoin (BTC) is also the most popular and highly valued, despite high volatility over the course of its history. Bitcoin was initially created to be used as a digital payment system, but experts say it is still too volatile to be used for that.
I agree with you but if you see there are many countries that have already legally accepted bitcoins. Looking towards the acceptance that bitcoin is gaining it seems they will find some means to link it with the physical world even if the linking of bitcoin with a digital payment gateway is a bit tough.