CarrionCrow: In that case, it'd be stupid of them to mess with that. They wrote a scenario that maintains the status quo forever.
Lame storytelling, but it works if you want to sell people incredibly expensive miniatures for decades.
For what it is, a table top game, the lore is very good, IMO. The level of detail and thought that went into it all is quite impressive. As you said, his role keeps the status quo, keeping the story going for as long as they need. It is just a shame how they decided to overcharge and treat their fans like idiots. But then what company doesn't end up doing that.
l0rdtr3k: Tell that to the World Eaters,Word Bearers,Alpha Legion,Death's Guard,Emperor's Children,Black Legion. They all succumbed and you and all of your Sisters will fall to Chaos!
And what happened to the traitor legions? They got their arses kicked back to the Warp and have been there crying like little girls ever since. Not even the Space Marines could best the Battle Sisters when they defended the Imperial Palace. Imagine what would have happened if we were around during the great heresy. You weak traitors would never have stood a chance. :-)