Once you have a taste of freedom....
This is what freedom is all about, as the people of Hong Kong know full well. It must be realized that many of the citizens of Hong Kong have relatives that live in mainland China and know the differences that exist between the democratic island and communist mainland.
I fear that Hong Kong will be turned into another Taiwan by the Chinese, considered a rogue "property" of China, and another headache that will have to be addressed at some time. At this point, I'm not sure how we could stop that from happening for, as Tiananmen Square showed us, the Chinese government has no problem crushing, through force, those dissenting from the government's view.
What we can do, however, is support the movement to keep Hong Kong a democracy in all diplomatic and financial ways.