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.
One thing I only knows l, fiat currency will never replaceabe maybe crypto could become an alternative mode of payment but he will never replace fiat. Why? simply because there are some places especially in third world country that don't have internet connection and we know that the only way we can use crypto is through online. Just like what I have mention cryptocurrency could be better use for online transaction while fiat for physical transaction.