JMA posed an important strategic question, albeit with application beyond Afghanistan:
The Chinese approach has not been tested. When the regimes (who have been bought by the Chinese) fail to protect the Chinese 'investments' (which are being more readily seen as the looting of national resources) or the regime changes and the new one also wants a piece of the action we will see how the Chinese react.
This issue appeared once briefly at an Oxford conference on international terrorism, in the Africa session; remarks were made about the Tan-Zam railway and the social consequences with dual heritage / mixed race children.

We may have a test case in Zambia, where in a democratic election the new President has indicated a different stance on foreign investors:
..he has frequently criticised foreign mining firms - often from China - about labour conditions. While the party has disputed media reports that it is anti-Chinese, his election is likely to shake up the way contracts are awarded, our correspondent says.
Link:http://www.bbc.co.uk/news/world-africa-15039094 For more on the new President: http://www.bbc.co.uk/news/world-africa-15034694