I think you are exactly right. I for one do not blame them for doing what is best for them right now, but ultimately there will be consequences that will affect them. If flow through is the main motivation it will be meaningless as more mainline flying is replaced.
Secondly, I think eventually we will see an erosion of scope from all the majors in exchange for higher pay. Again, short term thinking from those in their last decade or so who see the direction of airline flying, larger regional jets and proportionately larger mainline jets but less upward movement for both.