I think GM not staying longer on Action really killed the momentum for the New 52 Superman. Superman absolutely needed a stable team with a 4-5 years long run to develop the supporting cast, the setting and demonstrate the kind of stories you could tell with new 52. But instead it fell back to a revolving door of creators. I think that is the number one reason that Superdad ultimately triumphed over Superbro. Superdad had a longer established history compared to the Nu52 Superman who was just editorially mismanaged (besides Morrison's brief run)..