China is slowly becoming a more democratic country because its people will continue to demand it. As they transact more business with the West and the people of China get more exposure to our lifestyle and freedoms they will want to be a part of it.
This will take time and those in power will resist the need to give up their corruption and influence. The rapid expansion of China really begun in the 1970's with Nixon's effort to reach out. Forty years have passed since then and now China is a world power and growing.
It may take another forty years before China's politics and economy becomes more like the west but it is inevitable. Unfortunately, we seem to be on a path of greater centralization of power and wealth. This power grab is coming not from the government but rather from our wealthy class and their conglomerates who are controlling more and more markets and politicians as a result of buying them with campaign contributions.
Here is a peek of what the year 2030 will look like.