Total removal of fiat from the society will do more harm than good.
No matter the level of technological development, not everyone will be able to embrace cashless transactions. And also, most services need to be paid in cash.
I agree with this, and we cannot remove fiat completely in our systems because how about the people who doesn't even have any access to the internet. We all know bitcoin is used because we have internet connection. Poor people cannot access the internet so how would they live in a cashless society? We need to think it further.