As far as Justice League, there is a petition to release the Snyder cut.
If the Big wigs in WB would just swallow their pride and let Snyder release his directors cut in theaters, again, it could add several hundred million more to JL box office numbers. If it turned out actually amazing and word of mouth that it is much better than the original...heck, it might also break the billion dollar mark.
But the idiots at WB clearly dont know what they are doing. So who knows.
I do hope that someday, we might actually get to see the JL Snyder cut.
No doubt JL would have done better box office if the Snyder director's cut was released originally, but it's likely that WB view it as not worth the time & effort now. I read that while he filmed something like 98% of his vision (factoring in planned reshoots), the visual effects were nowhere close to being that complete. As those typically are a big chunk of the production budget on movies like this, it seems highly unlikely that WB would want to foot that bill - especially after probably paying a premium for them with all the late changes on the original release.