Actually seems to me like the "nobody can staff it argument" is playing out exactly as forecast.
Let's see.
PSA can't staff our CRJs
Someone can't staff out ERJs
Republic can't staff the 175s, to what extent hasn't even been made public yet.
This whole pilot shortage thing doesn't actually get better anytime soon, it gets exponentially worse, so your only seeing just the tip.
The entire landscape will change dramatically in the next 5 years. And planes will go unstaffed, American thinks they have it figured out with the whole pipeline thing, meanwhile united and delta have been hiring 100 a month and will continue to, which outpaces growth and retirements (they're front loading talent). Which American can't even do to the same extent because of training center limitations and flow through commitments.
Things are going to change, and they don't have it figured out yet.