Could Warner decide to change their minds? Sure. One thing is clear: they don't have a real game plan. There is no Kevin Feige at the helm. Zack Snyder was the closest thing they had and gave him the keys to the kingdom without much oversight, and then they were surprised when the product was met with divided fans and critical backlash. I blame WB/DC more than I do Snyder. From the first film in the DCEU - Man of Steel - they have been reactionary to the market of superhero films, to Christopher Nolan's Dark Knight films, and to Marvel's success. Event their decisions during Justice League's notorious reshoots and subsequent replanning stink of being reactionary. The plan is to react. They react when something is good (The fans love Wonder Woman! We have to make it less grim and gritty! Fix it with reshoots!), and they react when something is bad (there are currently no plans for more Justice League, and they were originally going to use Flash's film to soft reboot the DCEU, but now it is unclear what they are doing with that film).
I'm a little disappointed that instead of righting the ship, so to speak, they've opted for a more singular film success plan which is arguably what they should have done in the first place. MoS kinda did it, but then they immediately jumped to BvS which was like a 2 1/2 hour trailer for an expanded universe done in an incredibly juvenile way. And I say that as someone who sort of liked it. I liked many scenes in the film, but the overall narrative doesn't work and the characterizations of the main leads are often forced down the viewers throats while asking for huge leaps of logic and absolving characters for being, well, stupid.
I'm a huge fan of DC characters, probably moreso than Marvel, and I can't help but feel like they wanted the success of Marvel without putting in the work. Even with that being the case, we're getting Aquaman (early buzz on the film is that it is good), WW84, and Shazam. I have high hopes for all. I also remember telling friends a year or more ago that, "Wouldn't it be funny if the Superman and Batman in the DCEU weren't done right but Wonder Woman and Aquaman were?" I'm afraid that after the release of Aquaman, I might realize I was a prophet. A seer. I honestly didn't want to be right after I said it. It was a joke. Why can't they all be great?
DC Entertainment President Diane Nelson (I believe she has either relinquished this position or will soon) stated recently, "there's no insistence upon an overall story line or interconnectivity in that universe." That's a nice way of saying it doesn't all take place in the same universe like Marvel does it. Justice League seems to have killed the DCEU. (I still haven't seen it.) If it had been awesome, you can bet they would have stuck with it. This idea that the films don't need to connect was proven this past week when the Joker origin film was announced.