Lets face it the company would simply like to lay off all the boeing and MCd D pilots as those fleets are going, most of those pilots are more senior and thus paid more and it saves on retraining. Thats the cheapest option and without BALPA thats exactly what would happen.
To counter that LIFO is the simplest and fairest way of dealing with redundancies and demotions.
At least they are offering VR so that will thin some ranks at the top.