I think the check in process is a bit more involved than we're giving it credit. There are specific computer systems to learn and to train all cabin crew to be able to swop to checkin duties at a moments notice would be pointless and expensive. Cabin crew would be used for queue walking and general direction of customers, that's all, freeing up the ground staff for check in duties. You don't need training or a contract change as that sort of work can be done now by volunteers.
Also, cynicalmoose, I hope the short sellers get there @@@@s kicked.