From a neutral perspective on a purely economic stand point I believe Beijing may kill the hen that lays the golden egg.
The "golden goose" will survive just fine. Its feathers ruffled somewhat to be sure, but as long as there are profits to be made, businesspeople great and small will make them. Commerce may suffer short-term setbacks, but will recover for the long-run.
From how I see it Beijing is taking over the same system that the British enforced so in terms of political system it is the same.
You are far off base, honored Padawan. The only system the British ever enforced was one based on oppression and subjection of Hong Kong locals as servants, coolies, and second-class subjects of the English crown. The British occupied Hong Kong for over a century, and at no time in their sordid history did it ever seriously consider democracy for its "subjects" till just a few years before they were thrown out by their ears. Hong Kong leaders tried many times to gain democratic representation in UK Parliament, but were put down each and every time, and in some instances, with wanton brutality. THAT is the totality of British occupation of Hong Kong, and I thank you to learn it!
On the other hand foreign investors had different set of rules from the ones that is enforced in mainland China with lot more leeway utilizing the same freedom in business practice as it was back in the British colonial days with ensured freedom.
At the moment Beijing is casting doubts on that part and investors moving on speculation will certainly consider the risks connecting to bad for business. It may settle down to no change but at that time the damage have been done which will take a certain time to recover or not recover at all thus the result of killing the hen.
Here’s the dirty little secret, Samurai; all the rants and raves of HK protesters wouldn’t make any long-term difference on the economic vitality of Hong Kong, because the movers and shakers who really matter are the bankers, politicians, tycoons, and plutocrats that meet in country clubs, golf courses, bank vaults, and The Great Hall of the People.