not if it can detach itself, from that useless crap of printend money everyday, fiat is now needed to point a value for it, but in the future i'm sure bitcoin can work for itself, when the fully stability is achieved
How are they gonna work it in the future? People sure need fiat altough bitcoin is in a stable condition, they need to buy it then convert it to bitcoin too so with the stability of bitcoin, fiat is still needed they can't be detach each other. New people will still need to buy it anyway and sure its hard for use to get it from faucets so bitcoin and fiat must stick together in other to survive
i mean, it will work like any other currency, like you exchange euro with dollars if you need it, but then you don't need to buy back fiat, because bitcoin will be used directly for everything not just buying stuff online(we are talking about a very far away future, probably even beyond fully adoption), so fiat will only be needed to buy it
I think we can't do the same thing to bitcoin. Like you said euro and dollar you just need to exchange it easily because both of it is well known as a currency in this world mean while bitcoin is an unknown method of payment, people wont believe it anyway and they need change it back to fiat too after they lose their hope in bitcoin