My guess is that double whammy of Batwomangate and Harleygate in one month was the final straw for the corporate bosses. Both of these PR fiascos received mainstream media coverage. Keep in mind that DC Comics' brass sees any publicity as good publicity. They have been proven wrong, of course.
Let's not forget DiDio and Lee's snotty, hamfisted response to these disasters. If I had to guess, they received an earful from Nelson and/or Tsujihara and are now being watched very closely.
On an unrelated note, I keep seeing Villains Month books on the racks of my local LCS in Manhattan. On sale for 40 percent off. Yes, even the 3D covers. It's November