Anybody look at the threads of pilots coming back from other careers; second career pilots coming in; the military (all branches) hiring and will throwing off thousands of pilots over the 2020-2025 time frame. There was a time you had to be ex-mil or lots of civilian time in corporate jets ( there were no RJs) and under 32 to get hired. That when there were scarcities of pilots; now, just wait, there'll be plenty to fill the seats. Yes, lots of RJ flying will go away for less frequent B717, C-Series, etc flying to reduce the number of required pilots, marginally profitable routes will be dropped or reduce service. This has all been seen before. I'd bet the main lines could increase the cruise speed and save a couple hundred pilot positions. It was the opposite during the fuel crunches, slowing to LRC saved some furloughs.
GF