At some point in the near future the pollution issue will become the greatest obstacle to recruiting into Hong kong - not just for CX but all corporates. Then watch the salaries go up. The only workable solution for CX will be more and more based guys - which ironically will save the company money. Also it will mean that CX will start to steal pilots off other Asian carriers - ie. recruit Thai or Malaysian or Filipino pilots to be based in their respective home cities.
Tough luck for expats....