Plus, their emphasis on sons is going to produce a huge surplus of single men with no one to marry in a few decades. All in all, I'd say things don't look that rosy for China. Historically, the solution for nations with surplus men has been to send them to war to acquire more real estate (and females).
Things look a lot less rosy for the nations targeted for acquisition.
My Chinese friends locally insist that China has targeted the USA for acquisition but only after plenty of their other ducks are in a row.