When you look at the demography of all legacy airlines then you will see that the flat lining is only a matter of time before there will be huge surge through the ranks. The slow down is really a product of the change in retirement ages.
The Air NZ pilots getting onto the Airbus LHS are all approaching 50 and those getting to the B767 and B777 are approaching 60. This is a huge bubble moving through but stalled by the pensioners not leaving the airline.
When this bubble finally bursts it is all going to hell in a hand basket with the movement expected.