I haven't seen it honestly, most people who know bitcoin now just using bitcoin as an investment place, yeah I rarely see it since the fee transaction is getting high right now, so many people will use money fiat only for their transaction.

Moreover with a country, it'll be weird if there is a country that uses bitcoin as a main of payment system and they abandoned money fiat, it will be really weird. You have to know that many countries still ban bitcoin especially for a payment system, even there are some countries that applies a rule where if the people use the payment system with bitcoin or they use bitcoin for anything, the government does not hesitate to give punishment for them.