It's amazing no one hasn't been killed yet. I don't expect PAP intervention unless martial law is declared which will happen if it turns into a full blown rioting or if an officer is killed.
The sad thing is what will happen afterwards. HK will no longer be the financial hub it once was especially to foreign companies. These protest have damage that aspect of the city. It will longer be the regional HQ to many companies.
Singapore is one the biggest winner from all this. Shanghai the other.
If powers hostile to China are committed to trade de-coupling anyways then it's better that China gets a cleaner Hong Kong after all this and Hong Kong gets a boot in the butt to reinvent itself and to integrate with the rest of China, sometimes creative destruction is needed, the status quo isn't always all it's cracked up to be.