A billion is definitely off the table. 800 plus is still very likely but you just never know. The one thing that I think we can all agree about is this movie has performed unpredictably.
From what I understand the 830 bottom "happy line" is pretty accurate. My biggest concern is the long term picture. I just can't imagine a way that WB leaves Superman in the grave. My gut is still for a retooling of JL instead of a major move. As a writer, it is easy to go in and make the minor tweaks that the screen play might need to please people. For instance, lets say there were alternate takes of all the superman scenes where he smiles and quips during the rescues...easy change. Far easier on paper than on film. If, as many people have said, WB knew they were in trouble, then they have know for months. There is no telling how much work has already gone into lightening the tone of the movie. In fact WB very clearly let Terrio announce the lighter tone of JL even before all hell broke loose with BvS.