If it's something made by the government or by banks then you should definitly know that it won't be private and they will have control of everything just like the banks right , nothing much will change .
and for what comes to the Paper money I don't think it will dissapaear , maybe on some countries yes but worldwide ?definitly not because some countries don't even use Credit cards for their transactions so ... yep
Paper money has been around for a long time, so it is difficult to use paper money because many people nowadays do not know how to use the technology as well as how to pay electronically. In my life, in my opinion, in the next 50 years in the world, there will be a payment method with more modern devices instead of cash.