There may actually be a pilot shortage at one point. It won't be at the majors though, it will be again at the regionals. The question is whether or not pilots will be able to capitalize off that shortage. I think management's answer will be first to increase the ease of transition to the mainline. Look at compass, the flow has attracted pilots with 5000+ hrs 121 experience to regional wages.
In other words, with scope relief the regionals have and will reap all the benefits of a pilot shortage. They will still put a whipsaw on lowering mainline salaries.