Apart from nothing lasts forever.. This is a speculative take too, as the OP. We don't know what will happen in China in the future. One thing is true: at the moment their change is towards more democracy and personal rights, and it's the exact opposite in the West. My theorty, a counter-theory to yours if you will, is that the wealth growth for the lower and middle classes declined or reversed in the West (US, Europe, Canada etc) since 70s, which coincides with the West divesting from industrial production and embracing the financialization of the economy. Today EU is officially applying censorship on media and trying hard on controlling the personal communications of persons, similar trends in US. We think we are better than China, but from the non-Western countries the difference isn't that big anymore.