It's a weird time to be a DC Comics fan. The movies based on those comics aren't all that great; the constant albatross that keeps hanging around the company's neck is bad for their PR image; the majority of the stories told in those New 52 comics aren't compelling; and doing line-wide reboots every few years keeps fans confused about which timeline to invest their money, time, and energy on (though DC is not calling this a reboot).
But the big secret behind this Rebirth reboot-not-a-reboot is that Dr. Manhattan (from Watchman) was behind the creation of the New 52 DC Universe. This means that Watchman is now canon in the DC universe.
So the entirety of New 52 universe stories are a huge giant sequel to Watchman?
Does this mean grim-gritty-grimdark New 52 DC universe?
Will the Joker be the Comedian in disguise?
Will Owlman in Earth-3 secretly be Nite Owl?
Will Silk Spectre kill Wonder Woman and take her place?
Will Rorshach fight Batman (and win)?
Or will DC Comics come up with stories far more stupid than the ones I just came up with (smart money says this will be the route they take).
This is the kind of idiocy that keeps me buying Knights of the Dinner Table comics.
The accumulated filth of all their reboots and price increases will foam up around their waists and all the DC comics executives and stockholders will look up at the fans and shout "Save us!" And they will whisper "no".