You will find most of the pilots in the RFDS, even now, are quite happy where they are, and don’t want to move on to anything else. That’s the kind of job it is. It’s for those who find flying at FL380 for 4hrs straight boring, and enjoy the people on people role that the RFDS gives
The other side of the coin is they would really love to fly passenger jets but just haven't be able to crack an interview.