Whoever has doubts about the shift has lost sight of history.
First it was the barter system which became obsolete because of its primitive tenets,then came along the exchange of precious items like gold, diamonds etc which made societies that lacked it to be subjected to societies that possessed it that had in abundance the precious items further causing so many wars that were for the purpose of conquest. After many year conquest was becoming costlier to maintain because armies were depleting newer means for survival were developing e.g people were becoming lawyers, merchants, artist engineers etc and also precious items were now set aside to store value, then came fiat currencies which has even perpetuated more inequality and is an instrument created and manipulated by governments that make it and use it for the interest of a those that bow to its will that subsequently oppress the helpless.
Cryptocurrency is the future of money with so much to make every person rich.