It is possible, but not widely in the near future. It will take time. But if you'll visualize it deeply, it'll gonna be more convenient. Imagine a life without paper bills, all you just need to bring with you is a ledger wallet. Or your phone, scan the barcode to pay it, it will conserve time for people next in line to you when you are in a store. Also, when you lost your fiat, you won't be able to get it back. If you have crypto payment, there's a lot of security options you will have, like two-step verification, google authenticator, Private keys, and the like.