From what I have seen so far in this forum and other crypto platforms, most of us want fiat eliminated. But let us not forget that there are still situations whereby we can't use crypto except fiat like in rural places without computers or even internet facilities.
We really cannot replaced nor eliminated fiat because as we all know that the fiat is the countries currency in which and also if we replaced the fiat then the crypto or the coins will be the only one we will used and we will measure the exact amount of this currency because there are no fiat we can depends for. You're right with your point that there are still some places that cannot use crypto, just for example are the rural places like province. In my country there are some provinces that still dont have any internet connection nor electricity so we cannot suggest to eliminate fiat.
You guys totally misunderstand the purpose/reason why cryptocurrency came into the picture cause it was actually not created to eliminate fiat currency but to serve as an alternative currency/payment system that will fix the economic meltdown and make people financial freedom.