That's just plain bullcrap. A steady stream of pilots is moving across to mainline from Network regularly. Why do you think people should join Rex or go to a GA company for even less money and worse conditions than the ones you reckon are so bad at Network?
Freedom and control over your career. It has always been the case forever. You can't tell me that if Network get really tight for pilots to the point of flight cancellations and you have a Mainline start date that you will be on that course. Now do you think that will do that to a Virgin, REX, GA or International applicant?