[smacktoward]

If what mattered to the CCP was keeping Hong Kong prosperous, why not extend "one country, two systems" indefinitely? Or extend it until such time as a majority of the citizens of Hong Kong vote to terminate it?

The CCP would never offer concessions like these, because this is a question of power, not economics. What matters to the CCP is that Hong Kong eventually be in a position where it can no longer defy it.

[deepVoid]

CCP has not decided not to extend "one country, two systems" either. 50 years is in the agreement with the UK when Hong Kong was returned to China. CCP has not said that they would not extend it either. I don't see why they would not if it works well for Hong Kong and CCP.