Mainland China has had an authoritarian government for thousands of years, and demanding recognition of democracy from them at this stage is about as much use as asking a tiger to eat lettuce. Against China, they cannot win, and if China enters Hong Kong to impose order, the cost will be unimaginable.
I think the best we can hope for is that the HK protestors don’t get wiped out and continue to erode the authority of the Chinese regime. The Red Chinese know they are thugs and their authority can come undone quickly if freedom is experienced. A revolution from within would be the best of all worlds.