Are you saying that it's running better than it used to in Hong Kong? I have no idea about the specific details. I am just drawing conclusions based on the historical precedents. As I understand we have one people with two political systems. Well, political systems evolve and change - sometimes very quickly. Let's not forget that Taiwan was a rather brutal dictatorship not so long ago. At the time, the dictatorship did not want to unite with equally or more brutal regime on the main land. Both systems evolved since then but I doubt they can erase common history that goes back thousands of years.This is definitely not true, you may have misconceptions on how democratic system running in Taiwan.
In any case, the assumption that Taiwan will never reunite with China is not somethhing US should rely on in making strategic decisions.