One thing that's common in games of this type is to have your companions join you until either you tick them off enough that they leave or until you actively dismiss them. I just think that if the game is going to focus more on you being a Person of Significance, you'd have a fair number of companions that would only join you for adventuring in certain areas. There could be a mix, of course, but I'd like to see at least a few potential companions who aren't ready to drop their entire lives and go gallivanting across the world with you at a moment's notice.