TheCorpulent1 said:
Here's a thought, though: Since Power Girl and Supergirl are alternate dimension counterparts, shouldn't they be destabilizing Hypertime by being in the same dimension? That's what happened when Walter and Wally West were present in the main DC dimension simultaneously for just a few days, let alone the months that Supergirl's now been on Earth.
Nope, because a few months ago at the big San Diego convention, Dan DiDio was sitting on an Infinite Crisis panel, and in response to a question from the audience, he said firmly:
"Hypertime is gone from the DCU."
Apparently, near as I can tell from the reports by people who were there and heard him say it, DiDio did not bother to define exactly what
changes that would mean in the way DC told stories in its comic books from now on.
My own take on it was something along these lines: "Is he saying that alternate timelines are gone now? Probably not. That we will never again see characters from the mainstream Earth of the DCU successfully travel to and from those alternate timelines? Probably not. That shameless retcons and reboots are gone? Probably not. That writers won't be allowed to contradict each other at the drop of a hat? Probably not. So what is he saying? Probably that the
word 'Hypertime' will no longer be
mentioned as the excuse for all of the above, although of course all of the above will
continue to happen, same as before!"
I should add that he was probably also saying that Mark Waid's "rules of Hypertime" will never be seen or heard from again, so we should stop worrying about them.
Of course, all of the above is merely my Best Guess as to what he meant by that short, simple sentence - but I suspect I'm pretty close to the truth.