Payment currencies evolve from time to time, starting from the barter era, until they find payment instruments in the form of money. and now the world is starting to develop very rapidly, now is the digital era, but I don't think the world will remove fiat money and replace it with this kind of payment.
I think for fiat money will still be like that. however, digital development of course will continue to be done. even I heard the news, that the making of fiat in digital form is currently being developed by several countries. This might be a development of payment technology that is very fast and can happen anywhere.