Tesla will release the PowerWall thing in Africa next year, South Africa might very well get Tesla cars as well but it's some what of a unique case where it comes to the rest of the continent. But anyhow no Tesla wont sell it's cars in Africa just like BMW won't sell it's cars in Africa (outside of few corrupt government officials) even their planned 30,000$ car is way too expensive for most of the world.

Africa is also not a very good place to sell electric cars in it lacks the required infrastructure it has at least 3-4 more decades of development until electric cars will be viable there. Africa needs cheap, dependable preferably multi-fuel (diesel/bio-diesel) cars, it might be able to handle hybrids but even that is pushing it.

China doesn't need to replicate Tesla, if they make an electric car which is just good enough it will have huge impact on the air-quality in the cities and sine China is pretty much the only country which is developing and building new nuclear power plants as well as leading the research into fusion when it will be able to make even a 1/3rd of a Tesla it should have enough emission free electricity to actual make a big difference.

China is also quite good at actually completing tasks it sets it's sights on no matter the "cost" or what the market says if the Government will put electric cars by 2025 as a mandate the rest will fall in line.