* Yes it is true that if we ordain women priests, under present theology and rules, they can also be bishops. And since the pope is merely the Bishop of Rome, of course we will one day have a female pope. 

* I don't know what you mean by "proper" in a non-moral sense. Best I can make out, you mean the mores of a given age. Mores are always changing, and thus "proper" in that sense also changes. Modesty is the most obvious example. 

* The Church is now a essentially tri-level monarchy -- pope and bishop and pastor are monarchs of their domains -- but the Church has always had and still has democratic elements (councils, and consistories that elect popes, and synods are current democracies; formerly bishops were democratically elected by their clergy or dioceses). There is no reason why the Church could not transform itself into a tri-level democracy. 

* Above all it is our theological morality that has evolved over time. That fact of history is not the same as saying anything goes.