Dynasties
This is an exerpt from my full post, but I think it deserves a post of its own:
My absolute favourite aspect of this game is the Dynasties, fantastic! What I would like to suggest is that when your main character dies (yes, let them die! - in battle or from old age), you can chose a successor - if you don't choose the first in line for the throne, your other offspring may rebel or defect to another faction, plotting vengeance and to capture your throne by force, Mordred-style.. Let the family trees continue in this way - this would make me want to continue to play, regardless of anything else. I really love this random factor, seeing the different faces that emerge from different unions. Let it continue! People often reload saved games if someone important dies, but this would give you more reason not to reload, just to experience the ups and downs of your Dynasty - it's the stuff that creates real and immersive stories within your game.
If your King was to die before you have children of elligible age - you would then need to chose a Hero to take up the mantle for your Kingdom - again, other Heroes may plot and revolt, but I think that this would create some fascinating sagas.. You could even have a traitor in your midst, spawned by your choice of leader and a disaffected rival - sabotaging cities and even plotting to assassinate the new king. Not sure if this would be possible, but I like the thought of it.