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.
Smartphone now a days is very common even living in the poor country had already smartphones maybe it is because they just wanted to have it as a communication and at the same rime work purposes. Though it is hard to achieve but they wanted. It is vwry easy to indulge yourself in this kind of activity it is because it is in demand and known everywhere.