Your argument is completely flawed. At CX it's plain obvious that they want the more expensive seniors to go. How will a no seniority system have helped?
The sad truth is that with these highly technologically advanced jets, you can train just about anyone to fly, err I mean push buttons.
How many times do you read about an XX year old captain being the youngest to command an A320 or B777. In the old days that would never have happened, for the simple fact that it took more skill and experience to pilot the old heavy jets.
Let's face it, seniority or no seniority this is a dead profession, and the pay scales are a reflection of that.