I have no idea how Aquaman is going to work out box office wise. Feels like it could go either way.
It's not channeling a cultural movement with a specific demographic (ala WW, BP, Coco, etc), the main character is known but not particularly popular, and Jason Momoa is known but moreso as female eyecandy than capable actor.
On the other hand, the visuals for an Aquaman movie would be crazy. And it's still a comic book movie; we've seen with Ryan Reynolds career that nobody gave or still gives any crap about him, except when he plays Deadpool.