One thing, why is everyone so sold on the "evil woman" idea?
What message would you produce by that?
An "evil woman" as the manipulative mastermind behind everything, controlling all these strong men, which essentially means the patriarchat is nothing but a woman's manipulative scheme to be the one and only leader... I don't know wether that is such a good narrative...
It also undermines Vivi as the main political reformer, which seems to be her EoS, considering how much her political skills and ethics have been highlighted and how all other Straw Hats are either incapable or uninterested. Why would a woman be needed if women are manipulative and evil? Especially with Big Mom already in this direction?
It also speaks for itself that the only major female villain, and only one that is fought by the male main cast, is an acid-drooling mentally deranged bag of meat.
Brutalizing a woman has been a common theme amongst the main villains, such as with Arlong, Crocodile, Enel, Spandam, Hody, Doflamingo...
We had all these evil men, and the community somewhat wants the story to end on the note that woman are actually worse?
Could you see Luffy beating up someone with a Nami body type, and would that sit well with you reading it? Punch the titties inwards? I don't think this works in Oda's artstyle...