And so the Chinese population explode, again, and balloon to become a burden? We've seen how population outstrip its potential in nations like India and the Philippines, the poor will naturally reproduce more and that's a disaster waiting to happen.
Despite all things, China's population is already 1.3 billion and in a few years will be 1.4 billion by current rate. Birth rate is low in urban regions is internationally common occurrence, such is the price of urbanization everywhere. China will be in better shape if its population is 0.3 billion less.
And in any case, even without birth control policy enforced there's a certainty that there'll be lesser birth because, by statistics, there're over 30 million Chinese male at martial age group will never be able to find a mate, the consequence of a patriarchal culture. With many young men, single and unbounded, the Chinese society face risk of turmoil and this age group will be the active participants. This is the more immediate problem.
This is about the few times that I'd defend China's domestic policy and against implementing the idealistic Western model. Without a strictly enforced birth control policy, China will crumple.