RJ v. Regional history
I appreciate Kaman's comments, above, and Wiggums' link to RJ history.
Further to Kaman's post, scope and reverse-code share aside, all of this is repetition of airline history. There have always been "regionals" and "mainlines." Let's go back even forty or fifty years ago and we hear the terms "feeder" and "trunk" being thrown about. So, what were the early "RJs"? Well, they weren't pure jets. RJs are a reflection of evolving technology.
A great example is the early (I mean 1940s and '50s) Frontier Airlines. The following is a wonderful website on Frontier's early history:
The Frontier Airlines History Page Early Frontier newspaper ad
Review of this history shows that Frontier was a regional that comprised the merger of three other regionals (hear that, Mesa?). Equipment? DC-3s. Fast-forward to 1976. I recall taking a flight on Frontier from Denver to Sidney, Nebraska on a Twotter!
There are others. Southern Airways, a regional, also operated DC-3s. Fast-forward about twenty years. Southern and another regional, North Central Airlines, merged and became Republic Airlines. Technology had advanced. I recall that North Central operated CV-580s. I recall during that same era taking a flight from BOS to BDL on an early RJ, a Mohawk BAC-111.
These examples document that nothing has really changed in the big picture. Instead of 3s feeding DC-7s or 707s, RJs as we know them feed Airbuses, etc.
Moreover, as Kaman notes, management is chortling while pilots bicker, just as did in times of yore. Just a thought to ponder.
Once again, great link to RJ history from Wiggums