What do you think about the outcome of the Great Council of 233 AC? The main question for the Great Council of 101 AC to me seems to have been female-line inheritance. But in 233 AC by both precedent and using male-line succession Maegor was clearly the proper heir. Do you think the fact that he was discounted so quickly speaks more to reluctance to have a long regency or fear of Aerion’s madness? Isn’t this sort of thinking destabilizing in the long run since it undermines primogeniture?

Probably both.

But is it destabilizing? Not necessarily – when Parliament decided that it got to decide who the King of England was rather than going by primogeniture, the British monarchy didn’t destabilize in the long run, it just changed the principle by which succession takes place. 

So in this case, subtly, the Great Council was establishing a precedent that, in the case of a disputed succession with a number of subpar candidates (a baby, a maester, a youngest son, etc.), the support of the majority is what makes the king legitimate.