China's greatest weakness besides inferior technology is its population. You saw what happens when any natural disaster strikes, hundreds of thousands of people die instead of what would be hundreds maybe, in America.
Attacking any major population center, and they are all within reach on their eastern seaboard, would be catastophic to them. Their losses and devastation would undermine mobilization efforts.
If you focus an attack on Beijing only, you can hold hostage an entire nation and ransom for the peace they will inevitably sue for.
However. China hates one thing about us right now. They are stuck. They are seeing us take control of energy-rich Central Asia, which they would love to get their hands on and can't because we are their biggest customer.
We buy their cheaply badly made lead-infested crap and if we stopped buying it, they would have to resort to cannibalism to feed their unsustainable population.
Their power is as much a myth as that of rusty Russia's was.