I am somewhat surprised that these comments have only just arisen on pprune. Dragonair have been sacking experienced captains for some time now.
It is not just a case of sacking captains who are invaluable to the company in their general experience but also in sacking captains who are experienced in flying in China. To my knowledge none of the captains were sacked for any professional wrong doing in their work.
I can remember back in 1993 when we had Airbus instructors who were highly experienced captains but nevertheless had considerable difficulties operating in China. To call Dragonair management shortsighted in sacking experienced captains would be putting it mildly.