The problem is that the Chinese government, in order to keep power, has systematically waged war on all forms of civil society. Notably Faun Gong and, more recently ,the Christian churches. That leaves no organization to take over if and when the Communist government collapses. It will be chaos, far worse than in the Soviet Union when it imploded. That was bad enough--leaving the KGB in command, Hence Putin and his ilk. There are reports that Patriarch Kirill of Moscow, whom Pope Francis just met in Cuba, is in fact and has always been a KGB agent, and has managed to amass a personal fortune of 4 billion dollars.
But never mind corruption, China is more likely to dissolve into chaos for some time.