I don't think we will see this exact incarnation of scope concessions. That would be impossible to sell even to the kool aid drinkers and the trust addicts. What I see them doing is trying to replace 50's with 70's or 76'ers or 70's with 76'ers on a slightly negative airframe/block hour basis and trying to paint that as a win. But to go for unlimited 70 seaters would rhetorically undo everything the "hard total DCI limits for the first time in history" from C2012.

I think the first TA will see attempted scope concessions at DCI (and if so it should be a no vote on that issue alone) but not unlimited 70s. That would be a huge overplay of their hand and would do more to unify us over RJ scope than we otherwise would be.