IMO, they will stop call backs around about March next year and start hiring anew. The excuse will be that 2 years have lapsed since we last flew and that they will have to give full conversions anyway and that there is no advantage to hiring those they made redundant.
the fired600 have very little chance of being recalled. As somebody said earlier, there’s a reason we were the first to go.
Happy to be proven wrong but not holding my breath.