I didn't think the market rate +10% was aimed at existing crew, hence the alleged recruitment problems. In my opinion and viewed as an outsider, it appears that the current T&C's are just to see what could be got away with. Posters are already suggesting representation to help negotiating T&C's upwards.
However, if you look at Virgin Engineering who have recently voted to reject union recognition, employers can give reward that employees are happy with, outside of negotiation.