Currently it will be hard to go into crypto completely, because we are just having little percentage of the total population of the world that accept bitcon or cryptocurrency, most stores don't accept bitcoin because the volatility and they don't really know how to handle, so I believe it won't be possible for now to go into cryptocurrency completely we still have to be making use of fiat currency, but I believe later in the future it will be possible.
The percentage of people who is using cryptocurrency is more related to people who is using fiat today, because for out side world everyone have little ideas of Bitcoin, so from my view cryptocurrency is not dominating over the world, because i don't that no country that don't know cryptocurrency or don't have Bitcoin awareness, but from the my understanding i know that both Bitcoin and fiat is working hand to hand and fiat currency cant be eliminated because of generally acceptance of cryptocurrencies and especially bitcoin
From your post, you said everyone is having little idea about bitcoin seriously I can say you are wrong, maybe in your country you can say everyone is having little idea about bitcon, but in my country is not like that, in my country just few people know about bitcoin, the percentage of people that don't know about bitcon is far more than the once that know about bitcoin, some people have not even heard the name bitcoin before.