I think the story is leaning towards all the cosmic forces coming into play
We've already seen Death and Chaos as The Jailer and Sargeras.
We've got Elune'Era as Life
Xala'tath as Void
Aman'Thul as the leader of the Pantheon of Order
Safe to say Azeroth will represent Light.
The 6 forces need to be equally balanced otherwise hell all breaks loose. And the Fatescribes did also mention The Jailer running out of Anima only caused a small crack in the balance.
Azeroth being the strongest titan of them all will more than likely upset the balance meaning Death and Chaos will also need to gain power aswell as Life and Order turning them villian in the process possibly - Death and Chaos are not permanently killed off for a reason. I can see a situation where The Jailer returns to restore the balance.