True, airlines need feed. IMO as well as many others they need the kind of feed circa early 1990's, i.e. turboprops. Kinda like when regionals were used correctly, as "commuters", not like now. Regionals are not regional airlines at all. Now some are technically classified as Nationals and Majors.
Therefore, there are a lot more regional jobs because of relaxed scope. You don't see the 2500 hour flight instructor desperate to find a 19 seat turboprop job like years ago. Yes we are all in this together, but regionals have grown rapidly and your plethora of jobs are around because of (poor) decisions by the guys at the Majors.
Don't get me wrong, I came up through the regional ranks. But I would have gotten to a Major much sooner(even with the state of our industry) if regionals were regional airlines flying regional routes with turboprops.
So...no, it really doesn't work in both directions. There are less Major jobs because of expanding regionals. This hurts all of our career progression.