The utility of the RJ (to management) was primarily as a whipsaw. The RJ revolution essentially deprofessionalized the airline industry. Period.
The DL MEC was too stupid to realize that there was no functional difference between a MD88 and RJ. RJs should have been on ML senority lists from day 1. Instead, once that camel's nose was in the tent, a forklift wasn't going to get him out. But, for the DL MEC since 1978, their only strategy was trying to throw someone else under the bus. Every gain they made was temporary, and every thing they gave away (like following flying during a merger, RJs, contract flying in the US 121 world, etc.) will take years to get back, if we ever have the leverage to do so. If anyone has got an issue with General Lee, or DL pilots as a group, that should be it.
Commuter lift and mainline lift, in a perfect world, work hand-in-glove. To say that long haul is the high yield isn't always correct. For example, the pax going LGA-DEN-ASE or DEN-CLT-HXD is paying through the nose for the last leg, and is getting a screaming good deal on the first. USAir lived off its commuter lift and Shuttle operations for years. WN and other LCCs made sure that the high-density to high-density city pairs would eventually be competed down to subsistance level yields, or the case of Florida, worse.
Look at F9, they've been successful to this point, but they just staked their claim that the only new revenue streams that will be available are shortrange commuter and long range int'l.
I think they're right, for what its worth.
Its somewhat academic, at this point. The RJ created the situation where this has happened...
1997. 22 year TW 72 captains make 100k/year, decent retirement, great work rules, decent benes, good work atmosphere.
2007. 22 year AA 76 captains make 160k/year, middling retirement, middling work rules, benes middling, hostile work environment.