Venezuela with the volatility of their fiat money, I expect to see more people interested and actively investing in crypto. If this reach a critical mass I expect to see people and business making transactions in crypto, simply to avoid exchanges and their commissions between crypto, dollar and the local currency.
The other possibility is technologically orientated nations like South Korea and Japan. Of course the citizens which use and invest in crypto have to reach maybe 20% of the population for us to see business adopting crypto in mass. If this come to transpire I can see the people preferring crypto currencies over fiat currencies. After all I believe that the world is at the doorstep of the next evolution of currencies
barter/salt -> gold/precious metals/precious stones/ -> paper currencies/national bonds (fiat money)-> digital currencies (crypto currencies)