This whole thread has got me thinking...I have an upcoming CNS-MEL-LAX on QF booked into business / first using Alaska points: in the event that they try to downgrade the CNS-MEL sector there would be little I could do in the event if I don't want to miss the MEL-LAX sector...
...flying as QF Platinum / LTG may provide a little protection, but flying as lowly low status Alaskan Airlines passenger might lead to different outcomes...
...also, there is little incentive for the airline to act ethically / honestly in these situations...scarey stuff....