I think the unbanding of the rates simply has to do with how UAL calculated pay rates for pre-BK CBAs. When I was hired in 2000, the bands were B747-400, B747-200, B777, DC10, B767/B757, B727, A320/319, B737. Banding the equipment during BK was just another concession and should be addressed in the same way as all the other concessions like Scope, pay and workrules.
Wendy Morse has publicly made it clear that eqiuipment unbanded pay rates is the goal of the JCAB.
The rest I won't attempt to discuss but I would hate to see short term greed cloud the advantages this benefit provides to our profession. These aircraft will eventually be replaced starting around 2015 so I don't think that is much of an issue even if it were fenced.