Having been with the orange bunch for over 10 years I have seen people come and go. However what I would say is that those of us on old " proper" contracts be they FO,s or Skippers tend to be happy with their lot. Thus there was very limited movement. Those that have left left for the following reasons mostly
1. Get long haul out of the system.
2. Return to country of origin.
3. To join a " legacy " Carrier.
The issue with your post is -
Don't go there unless you have no other option
In most cases there is no option and that I am afraid is down to the aspiring pilots of today. You have ATPL holders working in check in, as baggage handlers, as cabin crew and as dispatchers all throwing out CV,s in the vain hope of getting noticed.
These people would sell their sisters and prostitute their own terms and conditions to get into the right hand seat.
You can hardly blame management for cutting costs when people are willing to accept cadetships and flexi contracts which are less well financially rewarding. If they did otherwise they would be remiss. It is the law of supply and demand.