It all boils down to the housing in HKG.
Not true if our case here is EK and friends.
Have you lived in the Middle East? There's a lot more on offer in HKG IMO. Security, restaurants and cheap high quality alcohol, plenty of lifestyle escapes close by. Perhaps if you are a European and have never grown up with sunny days having a little boat on the Persian Gulf will be an attraction.
HKG's big issues are pollution and a toxic relationship between management and staff. This will drive some attrition. I just can not see any immediate attraction to the Mid East from HKG pilots; perhaps in the future expats on C scale will leave as DEC's more so than we are seeing today.