andyshuxin
Many of the secessionists hope for or expect an immediate collapse of the Chinese central government, either due to internal economic, political, or ethnic problems, or to external pressures applied especially by US, at which point, with support from the Anglosphere, they could obtain and sustain sovereignty.
Such is an advantage of separating written and spoken forms of a language: as the spoken form inevitably mutates over time and fractures over space, having a stable written form means people who would otherwise consider each other foreigners may (1) share a common understandable set of historical and cultural documents, (2) communicate with each other at least in letters, (3) identify each other's language as but a "variation" of the standard written form.
English, French, Spanish, and Portuguese remain largely uniform across the Oceans because they are spread across the Oceans only recently, that is, not long before centralised nation states, compulsory education, sound recording, radio broadcasting, and YouTube.
If the Brits had obtained permanent rights in the New Territories, the situation would have been different. But they hadn't and by contract had to return Hong Kong to China.
It has been argued, though, that they should have returned Hong Kong to Republic of China.