Freedom is a cultural thing
May I submit that China's lack of freedom is primarily due to self-censorship which is based on traditional know-how, and much of that is about how to be a model follower, good student, good test taker (whatever the test content is), and so on. One practice ground of self-censorship is the Chinese home, parents really suppress free thinking of kids by subjecting them to memorization of materials, some of which are either outdated or simply wrong). If there needs to be a revolution, it should first happen at home. In social life, the self-censorship is so bad that whenever someone is in power, the first thing he/she does is to create rules and restrictions (building dams), to show loyalty or to channel wealth... If I were Hu Jintao, I'd worry not about my position; I'd even call for more freedom... why not?