China has a major demographic problem because of the one child policy. Soon, it will have too much old people, a lowering of its active population and growing problems, just like Japan and now Europe.
That is still better than country with exploding population with no ability to feed themselves and
have to export the workers abroad to work as slaves.I think this is a little extreme. I do agree that China'a one child policy is good to keep their population levels in line with their resources and ability to feed their people, but as it is now they do not have this problem nor would they have it with slightly higher population levels.
A larger population also allows them to exert influence over others as they simply engage in a lot of commerce