Human Factor,
Both your bidline and our agreements have the protection that they are negotiated agreements and as such only negotiated changes can be made. Even though SFG does work to near scheme rules they are laid down in an MOA as are Mixed Fleets ( at the moment they are sharing the SFG MOA temporarily) which are also agreements that would require negotiation for change, although in the case of Mixed Fleet there is, at present, no one to negotiate with!!
I do however understand that if other airlines operate to less restrictive rules, this does add pressure for change on airlines like ours, so I can understand why we should all be worried.