This picture in an IMF article
https://www.imf.org/external/pubs/ft/fandd/2018/06/central-bank-monetary-policy-and-cryptocurrencies/he.pdfnote the following in the report
As a medium of exchange, crypto assets have certain advantages. They offer much of the anonymity of cash while also allowing transactions at long distances, and the unit of transaction can potentially be more divisible. These properties make crypto assets especially attractive for micro payments in the new sharing and service-based digital economy.
And unlike bank transfers, crypto asset transactions can be cleared and settled quickly without an intermediary. The advantages are especially apparent in cross-border payments, which are costly, cumbersome, and opaque. New services using distributed ledger technology and crypto assets have slashed the time it takes for cross-border payments to reach their destination from days to seconds by bypassing correspondent banking networks.
So we cannot rule out the possibility that some crypto assets will eventually be more widely adopted and fulfill more of the functions of money in some regions or private e-commerce networks.
