Yeah, if these future DC films aren’t connected then WB can’t start to expect diminishing returns. Marvel changed the game and a connected cinematic supehero universe is the expectation. I think WB will eventually want to try a JL team again, especially since a lot of the iconic characters will now have already been established (ie Superman, Batman, Wonder Woman, Aquaman, Flash, Hawkgirl, Hawkman, Black Canary, Shazam, Cyborg...etc, only missing Green Lantern really).