WW1984 will do insane numbers, even if it's not as "good" as the first one. Aquaman will do fine, unfortunately, simply because there's just not that much competition this holiday. Basically Bumblebee and Jungle Cruise, and that's it. But I'd bet anything it's the last time we ever see the character. It still won't do good enough to warrant a sequel. As for Shazam!, I can see it going it either way. Could tank, could be surprise hit, I have no idea.
Birds of Prey is happening no matter what, as is Flash most likely, but I bet both of those movie are the last time we see any of those characters ever again as well. If Aquaman and Shazam! both tank, Green Lantern Corps could be in jeopardy, but who knows.
I guess this is exclusive info, but I also know that WB is developing a Bane origin movie as well for some stupid reason, but I doubt it ever sees the light of day.
Honestly, I think by 2021/22 all that will be left is The Batman universe, a Man of Steel sequel, and a third Wonder Woman. In other words, back to the basics. Again, I'd bet heavy that after each of their next movies, we never see any of the ancillary characters again, at least in their current iterations. Basically, I think these characters are all going to die a long, slow death, with The Batman the only universe left standing in the end. We'll get a Man of Steel sequel eventually, but I can't see Cavill sticking with the character after that. And then a third WW movie will be the end of Gadot as well. The DCEU will finally end with her, is my guess, and by that time The Batman universe will have already established something different, maybe getting a trilogy out of that.