Board Thread:Arrow discussions/@comment-9346948-20181211010912/@comment-1410838-20181212010729

Ninja72 wrote: Honestly, earths merging would make too much of a mess and I really hope it does not happen. I agree. Having multiple earths makes it much easier to explain various differences and absences of characters between story arcs and have epic events like Crisis on Earth-X. And it's not like anyone has any trouble traveling from one earth to the other. So the downside of a merge outweighs any pros, IMO.

Plus, as another poster said, it makes it difficult to work Power Girl in if the producers are ever able to get the rights to her. Which I would love because I've always liked her more than Supergirl.