From my understanding of how Bitcoin was built, it doesn't need the approval of countries. It a value or currency that is meant to be used in peer-to-peer manner.
If you need to buy something from a local seller, just convince him/her to accept Bitcoin if he/she hasn't already done so. He could easily exchange it for fiat or keep it in his wallet.
Yeah, as long as there is an internet connection and we can connect to the blockchain network, every people can use bitcoin, and if there are many people in out there use bitcoin, then the adoption will happen.
Bitcoin adoption still in the process and right now, it still running in many places but we don't know how many people exactly have used bitcoin until now. We could only know by watching the transaction process in the blockchain.
From this year, people are trying to know more about bitcoin because bitcoin has spread in many websites. People are reading so many advertising about bitcoin and cryptocurrency, and I think they still searching what bitcoin is.