I don't see fiat going anywhere even if the value of btc reaches to 1 million people would still continue to use fiat, as there are many people who knows only to use fiat and no other currency.
Yes that is mostly the case with traditional people who believes in using traditional currency and for them accepting bitcoin as a currency is hard to believe.
That's true they don't want to experiment with their money, and we respect their feeling as its their hard earned money and they don't want to loose it simply by investing into something they are not aware about.