No idea why you would say that. China's policy focus would immediately change. Domestically it can no longer afford to focus solely on middle/upper-class growth due to the need to appease the majority of the population still living on low wages. The transparency of the decision making would also cause a lot of domestic policies to be revisited. Currently these decisions are made with the public in the dark. That would no longer be acceptable in a democracy.
On foreign policy and the geopolitical front, China will almost certainly pursue a reset with their neighbours. Whether this results in closer cooperation with the west, or continued antagonism remains to be seen. The Chinese military isn't in the same position as the USSR back in the 90s, and China will not inherit the position as the superpower heading the communist regimes. In any case, it will translate to real changes in how China deals with border issues and military expansion in the South China Sea.