Yes, Manadasystem, you are right, to a certain extent, for that does apply to many of the older FOs who may be getting a bit long in the tooth to look at a seniority system that will take 10 years or more to command. That does not apply to the younger pilot, who, having been here a year or so, and having experienced the culture of "no mistakes allowed", and then DECs start to join, and he sees his Upgrade slide to 7+ years away. He has nothing to stop him from walking away and, now that he has Big Shiny Jet time, joining a Major in his home country.
Of course, maybe the management have done their homework, and have been able to estimate just how hard the screws can be turned before crewing becomes a problem. Maybe, but I doubt it.