Probably too late but they don’t open the world up to their doors like we do as our birthrate also is at dangerous levels besides the colonists.
I guess they’ll have to speed up their plans for taking Taiwan. Either that or they’ll have to supply their army with walkers.
They main Chinese ethnic group are Han and there is an underlying racial issue of accepting other genotypes who are not. Minority groups that are not the preferred Han genetic makeup according to the Chinese government ... well you can get the idea. The uyghurs are the worst for the Han as they are not a genetically acceptable group, are social and religious outcasts to proper Chinese ways, and are nonconformists to the new social credit system. Other minorities may not be treated as bad but many other Chinese clans and non-Chinese indigenous tribes are isolated and lead poor lives. If you ain’t Han, you are s@%#.
So my reason for the diatribe is the Han do not treat non-Han well so open borders is likely not to happen. There more likely to take over more countries to export Chinese to. They Tolerate westerners if we bring something to the table to trade or we can be used. A good portion of the Han see other nations especially Asian nations, as trash. This is more of the northern Chinese problem , the Hong Kong area is a hodgepodge of ethnicity so status and money is king there.