I'd like to share some thoughts about the timing of the whole Rebirth operation, and - in particular - the whole Optimism vs Cynicism thing, that is one of the details which bugs me the most. This element of cynicism is particularly emphasized in several dialogues concerning SuperDad, and in some of the creators' interviews, too. As I said elsewhere, I think that they're making the New52 appear way darker than it really was in retrospect, in order to make the Rebirth issues way brighter in comparison.
Well, someone - I think that it was in this thread, but I am not 100% sure - said that SuperDad is DC's way to make their comics more similar to the movies. I don't think that I agree - SuperDad is too different from Henry Cavill's Superman: he has a kid, Luthor is thoroughly different, etc.
Buuuuut.... I'll play conspiracy theory just for once. Well, I'm beginning to think that the movies are involved in the operation, but not in the way most of us think. The Rebirth event has been announced in the exact same moment when Geoff Johns became involved in the creation of the DC movieverse as a producer - that is, the guy who is supposed to change the direction of movies which, rightly or wrongly, have been considered "too dark" for the viewers so far.
Well... What if Rebirth is just a giant marketing move which paves the way for Johns' involvement in the MOVIES, rather than the comics? That is: what if Rebirth is simply meant to build Johns' reputation as a torchbearer who will make brighter DC movies, rather than DC comic books? I think that this would justify a lot of the recent moves on DC's part. Including, but not limited to, the fact that for the most part DC Rebirth series are written by relatively secondary writers (including Jurgens). It's as if... Yes, it's a relaunch, but not a long-term revamp (not in the same way the New52 was, or appeared to be). I mean, I seriously doubt that in six months from now someone will be REALLY interested in Dan Abnett's Aquaman, except for longtime fans. But a lot of people will be interested in Geoff Johns' involvement in Justice League - the movie.
Basically, I've got the impression that comics are a secondary byproduct of this move. Before Rebirth, I wasn't so sure that Johns' involvement in DC movies would be this well-accepted - yes, he has lots of fans, but he was 100% involved in the New52 (it doesn't matter that it was mainly Didio's idea, Johns was entirely part of it) and his partial participation to GL - the movie didn't earn him a good reputation in cinematic adaptations. But I think that now people are looking at him more favorably.
Also: it works in a bizarrely meta way. "Geoff Johns is making the brightness of DCU fight the darkness of Alan Moore's Watchmen!" Well, just change "Alan Moore" with "Zack Snyder", and this statement will be more well-received.
Just conspiracy theory, as I said.