Pokemon Go has been wildly popular in all of the places it has been released so far, mainly in the United States and Japan. However, it isn't available in all key markets. Niantic has purposely staggered the release so that there aren't problems. It hasn't been available in a few key markets, including China and South Korea. Niantic is hoping that they can find a way to launch the games at some point soon. However, there are a few problems.
The main issue is that Google Maps doesn't work the same way in these countries that it does in the US. The mapping is limited and that is the foundation of the game, so it creates a few problems. It won't be easy to get the game up and running. However, if it wants to stay at (or near) the top, it needs to figure out a way, according to Android Headlines.
These difficulties definitely won't stop Niantic from trying to succeed in these key areas, and they have made it clear. In a recent interview with The Wall Street Journal, they mentioned that they do want to expand. The estimated earnings of the game are in excess of $700 million, so there is no doubt that they want to take on that success - especially in areas where there is high smartphone usage.
The growth will likely continue as Niantic adds more and more features to the game, including a new buddy Pokemon system. There is hope that a battle system will allow you to play your friends instead of just battling at PokeGyms.
According to Tsunekazu Ishihara, the Chief Executive of The Pokémon Company, there are more features planned for the future. Still, they don't want entry level players feeling too overwhelmed. They are slowly introducing more to keep current players interested.