The only DCEU movie that I can conceivable see being below 650 million is Birds of Prey, considering it's released near Bond 25 and it's Rated R. But it's apparently a small budget, so it should be able to do fine. But if Shazam can build on the good faith built created by Aquaman, then BoP and WW84 get released, I think the DCEU should be fine from here on out