How exactly do you think China is going to be able to "lead" the US? This is what I mean. The era of one hegemonic power being able to be the sole judge and authority on every single action around the globe was an extremely brief and freak incident in history, and that time is over. It required an extreme economic/tech imbalance that has rarely existed throughout history, no longer exists, and will probably not exist again for the foreseeable future. So whoever calls themselves the 'most powerful' is ultimately irrelevant - it would just be a mostly meaningless title.