Unlike many think, going back to China is not an option for most of the Chinese Americans. Although you do see many have gone back, vast majority have decided to stay in the US. As I have said before, take me as an example, my whole family is here and my career is here. Uprooting all that and going to another country is not an option. Also, we left China in the 80's because China was not ideal. And now we are leaving the US because the US is no longer ideal? What happens if China becomes non-ideal again? We move back to the US? This back and forth sounds very unacceptable to me ethically...
Let's leave the ethics out of it for a moment, just think who would still trust us again if we keep switching sides? Even if we go back to China, who do you think the Chinese government will suspect first when the US and China start another conflict? Yes, that would be the "Chinese American double spies" sent back to China by the US... You think we will be in a better boat? You think we won't be rounded up in some sort of camp? What do you think the common native Chinese will say about us? Keep in mind that, by that time, we would have switched sides twice... Where is our allegiance?
Although I fear a few irrational and unstable ones who would do crazy things (that's why I own firearms), I do believe that things in the US will turn for the better. This is not the 1950's and 1960's. We have gone through that and have learned our lessons. Also, Chinese Americans are no longer the same Japanese Americans during the WWII. We have our voices and our political clout.