3000 aircraft movements recorded in the Pearl River Delta one day last year with predictions of 5000 in a few years. 70% of traffic at HKG either heavy or super, A320/B737 are the C150 in the circuit and could quite conceivably be told to go to Zuhai or Macau once the bridge is finished.
Guangzhou being turned into a mini Dubai with cheap China Southern connecting flights all over the world, an already huge airport being further extended. New runway recently added.
New Shenzhen airport massive, taxiing feels like driving across a city.
Delays largely caused by Chinese military control of most of the airspace in China, they don't want to give up power but will eventually have to.