I am going to take a stab at this one.
Comic book movie/tv show fatigue.
I for one couldn't care less about keeping up with most of the shows. I was dedicated to Gotham, DD, and Agent Carter before it was cancelled, and even I can't keep on top of all those series. I saw some JJ, and IF, and personally was not impressed. It seems to me, they are employing the same CB tricks to pump their tv show ratings. Other than DD, I refuse to be hooked on anything. Batman had the most meaning for me but I absolutely detest B. Afleck as an actor.
DC and Marvel are both guilty of the same ploys. From a collector standpoint, I will only put money in the back issues. I rarely plunge in to the modern book market anymore. Digital sales and TPB make the most sense for a reader standpoint.