User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-800707-20120913022839/@comment-1038387-20120913095901

Not Earth-17's; that's taken. But, for example, Earth-22 has a Power Girl. But that was because Kingdom Come was written more as a dystopian future than an Elseworld. Her multiverse origin does make me think a more continuity heavy show like YJ won't use her.

The DCnU is not less complex. The problem with any reboot, be it Crisis on Infinite Earths (COIE) or Flashpoint, is that they don't want to alienate too many people, and don't fully reboot. With COIE, they wanted to reboot Batman, Superman, Wonder Woman, but they left the New Teen Titans alone because it was such a popular title with the younger demographic - if it were a full reboot, Starfire, Raven, and Cyborg would have to go, and Nightwing would have to go back to his Robin persona. Similarly, Green Arrow and Green Lantern were mostly unchanged from their Silver Age selves. They had to do some asspulls with Mon-El and Andromeda to make the Legion work, but it was mostly unchanged too.

The same goes for the DCnU. Sure, everyone has new uniforms, and the major characters have all been rebooted, but Green Lantern (all titles), Hawk and Dove, and Firestorm all continue from Birghtest Day. Batwoman, Jonah Hex, Batwing and Frankenstein are still exactly the same as they were.

Retcon events, whether they're COIE, Zero Hour, or Flashpoint, all suffer from the fact that while they change, a lot stays the same, and those two may conflict.