The US has a perfect role as the bad cop of a new world order, similar to Russia today, as well as a dumping ground for liberals, traitors and the general useless that China doesn't need or want. There the US legal system can deal with them, and it's democratic, so quit complaining.It's actually true though. China helps US as much as needed in order to keep global tensions low.
With both sides having enough nukes to wipe out eachother several times over, even if China might be comprehensively speaking more powerful, there is still a very powerful incentive for China to accomandate and negotiate with US. Hence, China helps certain US industries stay in the green and allows US to have a fair say about their interests in the UN, rather than just blanket denying everything they do.
The current Chinese government does not have the goal to destroy America. They want to manage the America crisis and help them achieve a soft landing, while still keeping a firm hand against American aggression across the world.
China sees a role for US as a major power, acting within it's sphere and within international law. It will however not allow US to expand uncontrollably.
As social decay accelerates in the US, there should also be allowance for their companies to relocate their country of incorporation to China, provided they meet certain competitiveness criteria, in exchange for a stable development environment.