SIA operational management never wanted bases, they felt they were losing control and rosters became very fragmented. Basings were thrust upon them by the bean counters after an ex BA captain brought a so called 'expert' out from the UK to convince them. As soon as operations could they closed down the bases, full roster flexibility is returning, now expat terms in Singapore are fading fast also.
As the management in CX becomes more local I suspect you are looking at the same CX that existed thirty years ago, everyone based in HKG, if you want the job you move to HKG, if not, "next please". Not very encouraging, I know, but I think you will find that 'HKG only' on ever reducing T & Cs is the long term reality.
