Just going to play a little devil's advocate.

Currently, yes, greenslips are few and far between for west coast 7ER FOs. SEA and LAX 7ER were staffed for the SEA-Asia and Hawaii-Asia flying that was being done before it was transferred to other fleets or eliminated for the time being due to covid. SEA 7ER at its peak was something like 110 As and 200 Bs. FO staffing there hasn't been an issue lately because of that. However, the April AE removed the augmentation out of both bases, which combined with the massive churn in all of the 7ER FO categories, should result in more greenslip opportunities for FOs. That being said, I think it's unlikely you're going to make any extra money on the 7ER vs the 320 or the 73N.

As far as hawaii goes, yes, I would assume the 321NEOs will eventually replace most of the 7ER flying to there off the west coast. That being said, I think we're probably at least a year, and more likely 2 years away from that happening en masse. It will take time to get enough frames on property, and I would think the plane will likely spend a year or so flying domestically as they work out the kinks before they send them to Hawaii. Once that does happen, LAX 7ER is likely to shrink, allowing for a potential displacement bid, and SEA 7ER is likely toast.

Also, anyone either currently on property or just about to come on property shouldn't have to worry about being in the bottom 10% out west. The April AE left ~25% of the total SEA 7ER B and ~30% of the LAX 7ER B positions open.