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.
The question of eliminating fiat is one for the far future. I don't think it's even really a relevant question at this point. I'm far more concerned with getting crypto into mainstream use. We hear a lot about use-cases for various coins, but it's all in the future. There's very little that is actually in use now. Maybe XRP, but the others aren't really anywhere as yet. It will come, but it will take time. And removing fiat as an option is a long way after that.