Ironically, China has probably benefited from US hegemony more than any other major country. They are highly dependent on imports of food, fertilizer, energy, and raw materials. The US Navy has kept their sea lines of communication open for free since the end of WW2. Imagine a scenario where the US pulls back and another country like, let's say, India decided to close down China's trade routes. China would be in an economic crisis within months. China is now working to build up a blue water navy and they have other ways to retaliate against threats, but still they are in a very precarious strategic position.