A prophecy has been declared.
Well, at least to some Mehrunes Dagon worshippers. They assumed that destroying an Elder Scroll would make the invasion finally happen. This, however, does make Nirn weaker. However, the scroll's destruction would shatter the celestial worlds barriers and begin to pretty much collide into each other.
This caused the Daedric Princes to be forced out of their realms without their knowledge. They still have their powers. However, they seem a lot harder to control. Atherius seems fine for now. However, there still is a sense of urgency as the rest of the world can sense the urgency and the way the world may end.