Clearly you aren't an on-line merchant! No chance we'd support Bitcoin if we couldn't convert to fiat and the same will go for almost everyone out there.
Cool. Free country. (Well, not really free, but we all already knew that deep down.)
If Bitcoin without fiat is only useful for buying drugs and occasional 10k pizzas, I think it's best we find that out now. No need to waste time.
I bet it's useful for more than that though. Let's see.
But you need to get your fiat converted to bitcoin to begin with. Unless you want Bitcoin to only be for the miners or only for people who sell things to people who have bitcoin. In that case it is massive FAIL for bitcoin for anything but a very small niche market. Of course that is what is inevitable because the big Banks will make this happen but it's definitely not a good thing.