Warner Bros. would probably LOVE the idea, but CBS would have to eat crow if they had to pull off a ratings stunt after pushing the Supergirl show to the moon only to have it drop so far after only a few weeks.

As for the story itself, I really don’t see the big deal. Different Earths are already part of the Flash canon. Just add another Earth to the list with Supergirl in it. Earth 1 Earth 2, Earth 3…or “S” as the case may be. Simple.

Of course, having these different Earth’s around they could set up a story that introduces a threat to these Earths. A crisis, if you will. I seem to recall a certain comic miniseries that had a story like that. And a couple of well established DC characters were killed off in it, too. Slips my mind for the moment which ones they were. Oh well, I’m sure it’ll come to me.