I suspect the real reason it’s gonna tank is that it’s a shitty movie. A whole boatload of people got rooked into going because Warner Brothers, who made the movie AND owns rottentomatoes.com, suppressed the normal pre-movie-release reviews on their site (because they weren’t very good), and I’m convinced also paid legions of trolls to post thousands of fake user reviews all over the internet, e.g., there were a thousand glowing, one-liner user reviews on rottentomatoes BEFORE the movie even opened! And they pretty much all sounded alike: “Amazing movie. The critics are full of it ...”
Because of this, it’s no longer possible to judge whether to go see a movie based on user reviews. As a consequence, it’s best simply not to go at all and enjoy your giant HD TVs in the comfort of your own home, your own delicious food, beverages and snacks, and super high-quality TV series from around the world via ROKU (or similar) streaming from Netflix, Amazon, and a few from HBO (G.o.T., Westworld, and Silicon Valley).
Also, the fan boys always invade all the sites and props up the rating for all movies. They always go down when the average viewer weighs in.