If China's growth can be sustained, there will be more and more foreigners living in China permanently (as permanent residents). It's a pretty natural course. The Taiwanese are already settling in Shanghai en masse (millions there). Many Taiwanese still have families in Taiwan, but many also are starting families in China and buying property with intention to stay. Taiwan of course has much higher cultural affinity with China, but the point remains, if you are successful in China and your success appears to be sustainable, then you will likely stay. If China's growth can be sustained to 2050, I can assure there will be a lot more foreigners living in China permanently than today.
<< Taiwanese are already settling in Shanghai en mass ... >>
Fewer than 300,000. Plus around another 200,000 at any given time.
And every one of them must be counted as a hostage.
According to China, almost all Taiwanese are presently living in China.
Taiwanese are Chinese. And so are millions of "Vietnamese", "Malaysians" and "Indonesians".