Seniority only works for the Company and weak pilots.
If we had no seniority system and instead worked like doctors/lawyers/accountants etc then pilots would have a lot more industrial power. As it stands the Company know full well that no pilot is leaving. Having seniority as the standard across the industry has done far more harm to us than anything else.
Weak pilots are becoming more common as they know that the standard is low and that there is no point in acieving anything more than a minimum pass. Just wait your turn, take a couple goes at the upgrade, easier to pass you than get you out of the Company.