FTB, you're the wizard with the spreadsheets, and I think you've essentially nailed the dissonance between those who see this as a scope win and those who think there isn't enough protection. Some guys are inclined to think Option B is the plan and Delta hires and upgrades a bunch. It's certainly possible, if DL is really looking to spring ahead of the competition and not shrink in perpetuity. Others see Option C as a distinct possibility and can envision a world where 717s are replacement only, stagnation continues, and management gets a bunch more mainline-replacement jets they've been wanting a while anyways - all within the supposed protections of the TA. Also possible, in that it fits the trend of the last several years and RA's religion of capacity discipline.