When someone says, "but the performance of gold as an asset lasts 5,000 years"
You might be able to point out: "And then the arrival of the railroad, together with the horseless carriage, rendered the animals as transport obsolete."
Basically, computers, the web, mobile phones, and the internet are all expanded, improved versions of existing technologies. upgrading technology and techniques, actively doing something completely different for thousands of years. So, the future of currency (which is crypto) is here!
It is the future so predicting that kind of situation is possible since so many of communications around the revolves around the web and it is only a matter of time that the physical currency might dwindle of it's usefulness if the age of advanced banking or systems come.