On the one hand, there is nothing inherently wrong with the growth of an alternative to the USD as a global market currency, there are good arguments in favor of diversifying that function anyhow.
The dark side is that China has a history of being very good at economic subjugation in Africa. This feels a bit like a "lender of last resort" scenario, with a lot of contingencies and costly terms.
http://www.newyorker.com/news/news-desk/china-in-africa-the-...