The memes that will come out of the tidal wave of mockery and contempt that's flooding over this turkey will be the only worthwhile part of it - apart from the firing of Snyder and rebooting of the DC movies.
Current tracking from thursday night sales suggest an opening in the vicinity of $150 - $160 million, and that projects out to $400-$500 million domestic. Depending on how strong it plays internationally, it has a shot at $800-$900 million total. That's not enough below expectations to cause Warner to toss out their entire future movie line up and start from scratch. And I doubt they'd fire Snyder this deep in the process. If the reviews cause Warner to do anything, it will probably be to get a producer with a much shorter leash for Snyder on JL.
Except I'm not even sure in what direction they could pull the leash. Until I see the movie this weekend I can only speculate, but I think the common thread that links most of the reviews together is that the movie tries too hard to do too much and rewrite too much history and expectations, and that sounds more like studio direction. It is no secret that DC is trying to play catch up with Marvel, and they seem to be doing it in the worst possible way: by trying to short cut the process and get to JL as quickly as possible, rather than getting there organically the way Marvel did. Snyder was probably an extremely willing co-conspirator, but not the driving engine there.
For me there's a weird irony to the fact that many blame Nolan's bat-trilogy for setting the darkity-dark tone that Warner thought was appropriate for Man of Steel and then BvS, and yet if you're really a student of Nolan his Batman movies actually say the exact opposite thing.