How do they plan to Twitchell over 200 pilots every month and why would they want to give up that many great trips.
Who cares? Let them. If they have enough seniority in their equipment to make it work, it means they have enough seniority to hold a better paying position but at a lower seniority level and are actually screwing themselves out of higher pay and career advancement. The screeching about career stagnation would mean more if most of us didn't choose to do it to ourselves anyway.
Eventually they will figure out how childish they are being and realize that this is actually a good thing. Then they will quietly stop whining and bitching about it.