China will get democracy one day. It will be because a large swath of Chinese people want it. Although there have been some high profile dissidents in China over the last 30 years, including Liu Xiaobo and the 1989 students, most Chinese are probably not ready for their message of political openness. They're still focused on lower levels of the Maslow hierarchy like shelter and food.
These dissidents have the bad luck of poor timing. In another 30 or 40 years when China is fully developed, their ideas may be well accepted among citizenry and party reformers.