Maybe, who knows until the sales data comes in? I think there could be potential there, and if nothing else it's a way to build up Kara's mythology without stealing more from Clark. But that's not Karen.
And you're right that DC doesn't use her multiversal origin in her stories. That's my point. DC doesn't care enough about PG to use her biggest hook, even when it's proving successful. And that's been consistent throughout Karen's history. They made her an Atlantean in post-Crisis, and barely used her. They made her a dimensional refugee post-IC, and barely used her. They made her a grown up Supergirl in the New52, and barely used her. Why would some other big change get a different result? It won't.
If you're looking for the formula that'll make her popular and make her sell and make her stand out from the crowd....we already had it before the reboot, and DC didn't care even while they were cashing the check she earned them. *That* is the problem. DC does not care. And they won't care about "Karen, Supergirl's older space marine sister" any more than they care about "Karen, Supergirl's dimensional refugee doppelganger" or "Karen, Atlan's Atlantean descendant."
It is. She's living on a world surrounded by younger versions of people she loved who are not the people she loved, but almost are. That's weird and compelling and different, very Twilight Zone or Dr. Who-ish. That's a feature, not a flaw.As far as her being complex, I'm not saying that the sequence of events itself is complex, I'm saying that the emotional journey she went through is far more complex when you add the fact that she is an interdimensional refugee
Because she's good at, and enjoys, business? Because her universe died and that's where she ended up? Because she refused to live in Clark's shadow by using "Super" so she went with "Power" instead? The rest is just details.Why is she a CEO? Why did she come to this universe? How did she become Power Girl?
I'm presenting things in a simplified way to show that PG isn't a hard concept to use, adapt, or fit around other continuity details, yeah. Her story is indeed more complex than what I'm writing (I'm just talking outlines here, "Doomed planet, desperate scientists" type stuff), but it's not as cumbersome as you're saying. Hell, Miles Morales lost his universe and ended up in the 616 so there's proof on your LCS shelf right now that the base concept is easily workable. Karen herself was successful before the New52 with this same premise. The premise isn't the problem and never was. DC not caring is, and has always been, the problem. That's what has to change, otherwise every change will see the same sad result.The answers to all of these questions are waaayy too long and don't really come from a clear sequence of events.
If a copy of Supergirl is running around and getting involved with Superman, then why am I reading about the copy in the first place, instead of Kara? The fact that Karen does not live in Clark's shadow is part of why she works and what makes her distinct and unique.And from an outside perspective it doesn't really make sense for there to be another copy of Supergirl running around without having anything to do with her or with Superman.