User blog comment:TDM247/Is Supergirl going to become part of the Universe now or still be a different Earth/@comment-6284741-20160731205346/@comment-28545908-20160803045139

That is a really good point but zooms whole plan in the finale last year was pretty much the ant-monitors plot from crisis on infinite earths where he wanted to destroy the entire multiverse, so they wouldn't do it again.