The way China is building up right now, it will not matter.isn't this the way they begin to form a nato-style agreement though? you start small and then increase its scope afterwards
US is a federation empire, like the USSR. There are core territories and peripheral territories, such as Japan or Saudi for US and for USSR, Poland or Ukraine SSR.
China is not expecting to not fight any of the oligarchy's co-republics, it is a good bonus if they separate and betray the core territory's interest, but the principle manner in which the cold war is won is by surpassing all American subordinates, together, and then isolating them into uselessness. Naturally as that happens, some will rebel, hastening the process. But any smart planner wouldn't gamble the whole war on defections.
That is why, even after gaining a fair bit larger economy than America, China is still targeting further growth, further technological advances, diplomatic plays to hit NATO economies where it hurts and so on.