(a,b,c) I'm not sure about,because it's Localisation policy. (d )will only come into play if the system changes,which I doubt.
(e) well the rest of the world has caught up with pay,and has as good if not better leave etc.I would say they will have to reverse the flow of Gweilos going home and retiring first,before trying to increase the expat staff.
Everywhere is short of people and it would be interesting to see if HK could attract people to work there,if the money wasn't the prime factor.Somehow I doubt it.