China is not motivated by what makes economic sense. The party openly says this - the very fact corporations exist is a concession to not having achieved pure communism yet. The party openly hates the fact they need an economy, after having failed for the first few decades to operate without one.
All it takes, quite literally, is one hardcore communist after Xi who isn’t afraid of a second cultural revolution. Maybe a chance to fix all their consumption, housing, and youth issues once and for all in one painful societal restructuring? The very economic and social issues we point to as why they would never do it, I fear, might actually become reasons they will do it.