That sounds really cool, as a genre, actually. You would have to figure out what given NPCs actually want, and how you may be able to use that, to make them do what you want. And not based on some lame script, but complex world and character models. I'm sold!
closest thing ive gotten to that is eu4. How good the diplomacy model feels ebbs and flows, but I really do love the feeling of sitting there analysing alliance structures, friendships, rivalries, desires for specific bits of land etc until I finally figure out how to break up that bloc/pry out that country from their alliance group/get that large power to have reason to ally with me, a tiny dutchy
