Throughout the year, it's unknown how many people have died, nor how many Human Immortal Realm Powerhouses from the Immortal Realm have been sent over. Regardless of how many were sent, the end result was complete disappearance, something the entire Immortal Realm hadn't anticipated. If it weren't for the inability to send Earth Immortal Realm Powerhouses to Earth's side, they would have sent one to see what was happening long ago. But that's just their idea; the frequency of the Space Fluctuation Point is very small, making it impossible for them to send Earth Immortal Realm Powerhouses.
In short, those on the Immortal Realm side have almost been driven mad by Earth's side, and all the major sects are starting to discuss how they can re-enter Earth, something that is extremely important to them...
