I'm just taking an educated guess, but the reduction of shorthaul regional flying would leave a surplus of MAM casuals, who would get less call outs.
The only viable way they could remain flying would be applying to LH.
The advantages to QF would be minimal training, plus they would have a work history available . they know who they would want to keep.
The advantages to MAM is they would be now full time employees, with annual leave and other entitlements that they wouldn't have had, and if they are ambitious enough, they could be promoted after 4 years.
Really, I reckon they will be better off.
Question is, what will happen to any S/H who are waiting on the tranfer list? Will they have to work under these new conditions?