The Economist writes in the introduction of its survey on China:
There is no other important country whose likely trajectory over the next 20 years is more uncertain than China’s. Possibilities include:
An economy that continues to boom as the political system gradually becomes more liberal and China becomes an increasingly positive force in the world; A fast-growing economy, a surge of vengeful nationalism and an attempt by China to displace American power in Asia, regain Taiwan and challenge Japan; A country in disarray, engulfed by social and political crises as its economy slumps.
All are plausible. Much will depend on choices made by China itself and by other powers, especially America.