It is natural for there to be people to want to hold on to greater autonomy and ability for freedom of expression. And so those kinds of people try to resists moves that increases government control. Is not only like that in China (liu Xiaobo for example, along with Hong Kong democracy advocates) but so in other countries typical found in the right/conservative wing of the spectrum. If more freedom of expression was allowed in the PRC, even if still keeping single party rule, I'd imagine different factions within tbe party could evolve and part of the faction line drawing could be along the lines of government control. And so even if Hong Kong's 1 country 2 system was to end, if thete was such room for factions to evolve, people like Liu Xiaobo or Agnes Chow would be in a less government control faction. I think that is a natural desire to exist in many people. But China probably has strong deskre for tight control because of bad memory of different party factions and civil war but also from yhe lasting legacy of tight control with the establishment of the CCP and Mao.