Even without computers we can use crypto if we have smartphones but we can't use it if there's no internet.
We can't fully eliminate fiats, this is the truth for now because of the modern technologies that are emerging.
People can't decide on what they can trust and use but for us crypto rocks!
It will take time. I agree with OP. How about the countries which have high poverty rate wherein not all people afford to have a smartphone. Crypto is the future but as I said it will take time for us to be transitioned to a paperless society how about the government owned banks I don't think they have plans in getting into blockchains. We have to consider a lot of factors before all of this will happen.