I was wondering about this. many people want to encourage crypto adoption in their country. but whether when adoption happens they will use it. or they are more comfortable using FIAT.
Those "people" you stated is already within a specific niche of the cryptocurrencies community--since they want the adoption--, it will be absurd when the time already comes but they didn't use it in their daily life. They are favouring the adoption so I believe they will be all in into crypto.
If we talk about a broader subject, the mainstream, I believe they will use whatever is more convenient for them. Cryptocurrencies still need a major development in terms of scalability and ease of use for the regular Joe user.