Originally Posted by
Void Fallen
This "theory" is very far-fetched, especially since Warlords of Draenor literally started with the invasion of Azeroth, which then led into the siege of Draenor.
What will happen, and you mentioned right at the end of your post, is that N'zoth and the Black Empire will rise once more from the abyss, literally. That which was sunken shall rise again and those who were dreaming shall be awakened. This will lead into an actual Old God expansion, unlike this stupid, semi-faction war, mess of an expansion that should have just been about N'zoth and Azshara from the beginning.
But certainly Blizzard recognizes that N'zoth deserves his own expansion as the most charismatic and dangerous villain left, and shouldn't be thrown away in patch 8.3 along with the rest of the Black Empire storyline... at least I hope they do.