Some of you are looking at this issue from the pax point of view, and if that is the case, then yes, HKG is not your only option. Shenzhen is a good one, even Macau. However, we are talking from Hong Kong and CX's benefits, and that view a third runway is not only needed, but a must. Once HKG runs at full capacity, that means future businesses, be it pax or cargo, will be force to go to other airports if HKG can't handle them.

Personally, I think Hong Kong is too good of an airport, and too crucial for even China to give up too easily.