This way, unlike Diablo and Divine Divinity, the game will never end, because when you finish the official game you'll be able to create your own 'expansion games' and continue the game forever.
This makes it sound like Divine Divinity is somehow inferior to this title in the respect that it lacks this feature. I'm not sure it is a feature, however--at least, not to me. I mean, I can't just press a button to randomly generate any number of minor and major quests. (In fact, the KHK website makes a point in their features statement of boasting that they don't include any random quests.) So you have to actually build a new game in the quest editor; and it's been my experience that it's fun playing somebody else's, but not much fun playing your own.
Have you tried building quests in the NWN and Morrowind editors? What's your feeling about modules designed with those games? <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />