While these sources do lead somewhat toward the "Bubble Theory", I still have hopes that the whole world won't be destroyed. It would make absolutely no sense to have every race create these safety bubbles. Our most powerful slann had to off himself in order to save his race. Are we going to assume that every race will or is even capable of doing this? I think not. So unless GW has truly given up, I think the future is still bright for Warhammer.
That being said, here is my theory. I think these bubbles could come back down and wherever they land, they begin to terraform the area. New jungles, new locations, etc.. It could put us more in the center of world events rather than "that distant place across the ocean". Maybe not. I've just decided that I'm going to be positive until proven other wise. I have liked the majority of the new editions and have enjoyed 8th probably most of all.
Also... Has everyone forgotten Y2K? So many were so certain $*it was about to hit the fan and... nothing. Fear is the worst disease that can spread. So let's all just stay positive. Nothing wrong with being cautious, but don't rage quit until there is actually something to rage quit about.