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.
Fiat will not be eliminated, the still have their value and in a way compliment cryptocurrency. Projects like Mfchain are build to bring mass adoption of cryptocurrency to the people by tackling the problem of volatility, charge backs while, providing inter-blockchain connectivity. Fiat currency stills compliment projects like this, making a real life balance.