I think OP is suggesting expansion won't stop at Taiwan. What will happen to Filipinos who find themselves living in a new Chinese province?
Assimilation didn't stop with Hong Kong either, still a very different situation than Xinjiang.
Are you suggesting that they would have an interest in the Philippines? Which I don't think has any historical precedent? China has historically not been imperialist in the Western sense, they have been perfectly fine with other non-Chinese countries existing which is why there is still a Korea or Vietnam.
Isn't fighting China off a core part of their culture/history?