Thanks to bitcoin we got a new option if you cant trust fiat anymore. But I can say it will be living for long as long there are places that cannot be reached by technology. It will be only us who lives in cities can do it for now.
As you said bitcoin has given a new option to the ones who may don't trust fiat, but still the ones who are using bitcoin or the ones who does not believe in fiat are still using bitcoin because they need to, bitcoin is not yet used everywhere we spend fiat, so we are still compel to use fiat even if we don't believe it.