Without knowing it, we already use digital currencies as proxies for "real money" by way of bank to bank and nation to nation computer based account ledgers. We buy with plastic and think we're spending dollars, but the dollars exists only as a historical artifact of a time where paper certificates proxied for gold and silver.
Part of the disparity in the wealth of nations and individuals, comes from the very centralized control and arbitrary creation of "money". Quantitative easing has shown once again, that governments, not people decide the value and availability of "money", and those closest to those agencies, benefit first.
There is a reason why the magically appearing "dollars" of QE went directly to institutions and were NOT used to fund nation building at home or the employment of the jobless during the recession. To make things even worse, while the bankers were getting rich, the value of the common man's dollar went down.
Our existing currency does not serve the needs of the many, but the needs of the few. When gain the common man experiences is largely an artifact.
I'm not sure who or what is going to create a viable and accepted alternative currency, but I am sure its going to happen.
I see so many parallels to the early days of "micro-computers" with what's happening right now with Bitcoin and the like...
Remember this guy before he became the $1 Trillion dollar man?https://www.youtube.com/watch?v=aqURi4ITFTs