It's an interesting situation because a) BALPA have stated they want LIFO, but also b) their primary focus is to protect jobs. Anyone with brain can see these two items are mutually exclusive. One PP24 long haul skipper costs roughly as much as three PP34 DEPs, so if they have to meet a pre-defined cost reduction and they truly want LIFO, they risk costing jobs as opposed to saving them. Let's not forget that several of the reps may well be vulnerable under the proposed BA terms themselves, so I expect there to be some kind of hash involved if/when CR is required.
As has been said elsewhere, CR in the current climate could quite conceivably spell end of one's flying career. At this point it seems almost inevitable but I truly hope everything is being considered to avoid as much CR as possible.