And TBF there's a chance this does better than Aquaman because of Aquaman if the latter is well received. Aquaman has to directly follow JL, and Aquaman and Mera aren't incredibly popular characters like Squad's Harley Quinn/Joker and of course, Wonder Woman, to remain unaffected by previous DC misfires/missteps. Though hopefully if AQM is solid then the release period allows for a leggy run.
I think this is where the other kids/superheroes of the Shazam Family will come in handy. They are younger than Billy and of different ethnicities, and we haven't had a superhero film revolving around a whole bunch of kids. If they market it around all the kids instead of just Billy/Shazam, it will seem unique enough.