Not really. The pandemic hasn't caused people to "not" use fiat. People are still using fiat cash. Trust me. I see people using cash everyday like they used to before. People now just make sure they sterilize their hands after getting back home or to their destination (or do they?). People also still use cashless system such as card payments just like the pre pandemic times. Nothing has changed. Electronic cash system is sill the same. Digital currency such as bitcoin is still not being used as a mainstream currency (that is being accepted everywhere).
Crypto currencies should never be considered as "another source of income"!