I think to a certain degree, at least in Beijing. The Chinese people may differ, but at least in Beijing there is still that mentality. The whole historical barbarians-at-the-gate mentality is still there to a certain degree.
North Korea's stability is definitely an issue as well. China pulling the rug out from under North Korea at this moment might cause the whole country to implode. When you have a country that has nuclear weapons and nearly a million men under arms, that's a huge concern, especially with the border.
There's also what Marius mentioned—