If you haven't already, I recommend that you check out FireFall and see how it's structured.
It has some awesome components that would be welcome in any MMO.
One that is currently a shadow of its former self is the chosen taking over watchtowers in Coral Forest. Previously, the primary enemy of the game would take over a watchtower, and then use that as a sort of base to launch assaults on nearby watchtowers and outposts, until a huge swath of the game map was red. (the in game map displays chosen controlled areas as red so that you know to head there).
The game is, however, filled to the brim with well-done dynamic events.
currently you have to stay within a zone that's within 5 levels of you or you get less xp - which is a bummer because if you're skilled enough, you could actually handle stuff way higher level than you. That's because of a group of exploits that they had to deal with right after launch. I suspect that it's still a band-aid solution and it'll get lifted at some point. I could be wrong.
If you're a game designer though, it's definitely worth your time. Firefall was, after all, the first game to boast that there would be a completely free to play, triple-A title in the near future (a promise made several years back). They might not be the first but they've finally launched.