What is China's future? I believe it will be similar to Russia's, but with less alcoholism. Both had a centrally planned government that directed fairly obvious investment to move their economies from the agrarian to the industrial age. The move to the industrial age created an enormous amount of wealth in state owned enterprises, which are controlled by the priviliged and powerful few with connections to the state.
Neither nation has a powerful enough middle class, large enough young population, or history of democratic expectations to deliver economic and political power to the people. So this condition will exist for decades, if not centuries. Governments may come and go over that period, but not much will change. Efforts at privatization will merely solidify ownership by the privileged few, or will be mere shell games that hide the concentration of wealth.
With the obvious high return investments made and growth stagnating, China's elite will reap their rewards by systematically depleting every resource available, starting by absconding with foreign investment and continuing with the rape of natural resources. Unlike Russia, China does not have a surplus of petrochemical energy resources to export, so it will export the human energy (labor) of its people. To do that, it will practice wage repression, which may mean that investments to automation and robots in production lines are retarded from the natural flow of economic progression.
Similar to Russia, China will rattle its saber in foreign policy, but its elite are more interested in accumulating personal wealth than expanding a sovereign empire. As it becomes more apparent that China's growth is stagnating, their wealthy will increasingly put their money in asset purchases outside of China (real estate in North America rather than China). Similar to Russian oligarchs in London, the Chinese elite will buy property and hide assets in Canada, the US (particularly on the west coast of each) and Australia - because they never know when they might fall out of favor with the current regime. Their children will increasingly live outside of China, where their family assets are.
ps: Hopefully I'm wrong.