neumi5694: Since Warner Brothers / DC have no plan how to actually make the movies work, they got back to DCs multiverse concept
Breja: That's a bit unfair, seeing how Marvel's doing the same exact thing, isn't it?
With about 20 movies and several TV shows in their portfolio all playing in the same universe, I tend to disagree.
Breja: And anyway, it's not like the concept of the multiverse is where all these different versions of things start, at least as far as the movies are concerned.
The movies are only the end of the development. You now see it as a natural thing, but it started far away from that.
Of course not all comics are always canon, that is normal. DC was aware of the discrepancies and how it would confuse fans and actually wanted to get rid of it. They created the "Crisis" story arc, created the concept of parallel worlds coexisting and called it the "Multiverse". The storyline was about the Animonitor who wanted to destroy all worlds. In the end he was almost successful, one new world emerged with the last survivors from all universes.
But of course this could not last forever, new story arcs were created not fitting into that one official universe. Many years later DC had a second crisis, this time not as hard as the first one. What followed, was the New52, the 52 universes able to coexist.
After that a third sorf-of-crisis happened, DC tried a few things that fans didn't like and backed off (like having heroes from different realities fight each other, that was just stupid). Now we have the "Rebirth" universe, a mix of New52 and Back-To-The-Roots, while leaving other universes intact.
During the first crisis, many heroes were removed from DCs portfolio "for good", a few of them made it back only recently after they were gone for a very long time(the original Green Lantern and Flash, the Justice Society of America).
We can be quite sure that the original Batwoman and Batgirl will never return ^^. Their concept was way too stupid.
Marvel? I bet they bit their tongues for not having that idea first. They never came up with a cool alternative concept. Instead they made for example Peter Parker make a deal with the devil, eradicating and replacing reality.
It took them a long time to acknolodge that they had different parallel worlds and even longer to come up with a story that broke the boundaries of a single universe. Still they avoided the term "multiverse" at all costs. Instead they had the "Spider-verse", which was basically the same thing, but with a different name. The multiverse only made it into the movies recently with Spider-man and Dr. Strange.
Breja: Which is a really stupid rule to have, since we all know that anything that's ever introduced in comics can, and eventually almost certainly will, be brought back, no matter how "gone" it is.
The rule came from the name of their main comic line, which was called "New52". I think the name came from the 52 issues it was designed to last, but I am not sure about that. They used that number for the number of stable worlds in the story arc where horrors from the other worlds would come into the main universe.