It sounds like if the Void Lords can get the Old Gods to corrupt a planet with a slumbering World Soul (Azeroth, potentially?) it will give rise to a being that will act as a conduit for the Void Lords to make the jump to our physical plane, or it will simply be imbued with enough of the Void Lords' power and energy to do some really bad shit to our universe. And then everyone loses.
And it seems that Sargeras' P.O.V is one that's so excessively severe that it has to be stopped. Reminds me of Arthas and the Culling of Stratholme. Hero turned evil by their own view of what is necessary (and tainted with a bit of fear, of course). Very cool!
Going back to Sargeras, I'm guessing that the power we've accrued with our artifacts combined with the Pillars of Creation will be enough to either kill Sargeras, knock some sense into him, or cease his means of control over the Legion/stop the Legion invasions. That's a huge assumption in my eyes; Even with our tools, how can a meager mortal race hope to overcome a Titan? There's got to be something else that'll help us.
But then, even if we do overcome Sargeras & the Legion...the biggest threat of all is the Old Gods, whose strings are being pulled by the Void Lords. 100%. If they can corrupt a sleepy ol' titan, everything everywhere loses, and a Titan was so afraid of this future that he went all "To save life, I must destroy it, let it become corrupt." What chance do we have?
Interesting stuff. Off-topic too, but that's better than a bunch more "they already said they'd be gone" replies.