China is not really comparable since there is still a substantial reserve army of rural inhabitants that can be drawn into industry (900 mil urban/500 mil rural). Until the rural pop is drained you'll continue to see strong growth in china.
Artificial wombs are very controversial in the West, but they seem to be technically feasible (at least experiments in other mammalian species indicate so), and an authoritarian country like China, being squeezeed by demography while having significant scientific know-how, seem to be the most likely candidates for actually trying this out on humans.
I also wonder how this will impact certain regions differently since for example the now very famous Uyghurs and some other minorities were exempt from one child policy till it ended in 2016. Will their regions fare better economically or is this taxation and application of it in elderly care, pensions, etc a more top down federal thing?