The present system allows the top 2/3ds to have stability under rotational seniority no one has stability.
Lol. I call BS on that one! That's simply not true... both the first part of your sentence as well as the second part.
Significantly, a more equitable rostering system doesn't have to be a rotational one- it's just the one that most people are familiar with. Carmen has so many more capabilities than what our meagre minds have considered. It can do 'fair share' of weekends off. It can do fair share in terms of points awarded for particular things. It can do fair share in terms of night flying, early starts, late finishes, etc, etc.