What becomes clear here when you actually look at the numbers is that virtually all of the DC titles are losing ground each month, even things like Batman. There was a big surge with folks trying out the new 52, but since then there has been a consistent drop off across the board. It is better than the sales were before the re-boot, but the fact that it appears none of the titles are gaining ground or even really holding it is not a reason to raise the "mission accomplished" sign. A flagship title like Justice League lost 40% in the past year, and 11% just in the past 6 months. If you don't hold onto the new readers, it isn't going to be long before sales are right back where they were. Now, I do think the idea of getting away from the big events and concentrating on the ongoing series is a long overdue and solid strategy, but that could have been done without the big re-do.
Come back in a couple of years and look at sales, then we can see how big a success the new 52 was.