So from the MMO manifesto reactions article I'm not sure if I'm getting this right:
You kill a boss it stays dead for you but not for others. So... if you let a NPC town get over run and destroyed it will stay destroyed in your story but not for anyone else? So in other words a lot of phasing for each player. If thats correct then I'm not sure how thats going to work for people that play with friends etc.
I may have this all completely wrong lol.