I think you see a couple different strategies in play already. United has a bunch of 737's on order, presumably to bring some of the regional flying back in house. They've also partnered with regionals to set up de facto flows. American has invested heavily in their wholly-owned regionals and seems to want to solidify their future staffing outlook at mainline through flows.

The increases in pay at the regionals have brought people in from corporate jobs, 135 outfits, and other places which has sort of created a temporary stop gap. But I think at the end of the day you are going to see more and more flying be brought in house when the smaller regionals or those that don't offer the best career progression begin to shrink and/or fail. It's going to be tough times for some and I feel bad for the guys who ended up becoming regional lifers through no fault of their own, only bad timing with majors not hiring for a while. However, if you can stick it out, get some luck on your side, and do your best to check as many boxes on your apps, there will be more mainline opportunities out there for you. Just my opinion, but I truly think the airline industry is going to be completely different in 10 years.