Gulliver Foyle
Philosopher
Well, time and an increasingly autocratic leader that is chasing away foreign investment.
Well given that building ghost towns was thirty percent of the Chinese economy in the "good times", the country was in for a right land no matter what. But there's been strong indications from at least the 2000's that the Chinese economy has never been as large as either the CCP or the markets have been claiming. I remember reading an in-depth article from before the 2008 crash where, looking at energy usage trends, a Singaporean ecomonist estimated that the Chinese ecomony was about 25% smaller than claimed. Unfortunately I lost the article between moves and computer changes, because it was interesting and its citations were robust.