Back in 2008 when the place ran on overtime things were different. Now with overtime being all but non-existent putting an overtime ban on now would achieve nothing. I know there was more to it, but that alone showed up the failed management style of slashing the place of experienced staff.
I think the current leave them guessing strategy is excellent.
Plus the workload has changed, they have employed a few people, mainly AMEs who at this time have a binding EBA.