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!
We need both of them. Fiat cannot be eliminated in this world. Maybe, if all people can access in internet and it will become the regular needs of the people. But as of now, fiat plays vital role in our economy. Lots of opportunities are made by cryptocurrency, but in the end we turn it in fiat because it needs to buy our foods. Specially, in a 3rd world country just like what I live.