[bracobama]

In regards to your last point about being patient, both the US and China know that waiting an additional 20-30 years will be at the detriment of China as they cannot compete with US population replacement levels. Compare the following graphs: US projected population: https://i.imgur.com/0UN8eNy.jpg, China projected population: https://i.imgur.com/yDsLnnb.jpg.

[Marsymars]

Per those graphs, China will still have double the working-age population of the US by 2100.