> Mainland China would present many of the same challenges with the addition of living under an autocratic regime.

And with China now sliding back into madness of seventies again, I see lots, and lots of people leaving,... but they do not go back to the US, or West in general.

Out of all places, some went to Vietnam, some, to Taiwan, some try their luck in places which were never before associated with electronics industry. One rather serious company of a person I know quite well, whose success was entirely on it being in China, is now relocating to Singapore.