F/Os turning down Command training in preference for becoming S/Os with QF pretty much sums it up.
Once you have pushed people to the point of looking around at what else is available, then you are dealing with someone who has made up their mind to leave. Even if management offer to back off and leave the status quo as it stands, most of the affected will still leave and a large improvement to current Ts & Cs will be needed to reverse the trajectory that has been gathering impetus.