Hmm...
It sounds cool, but there's just not enough content. The Netflix shows only work because they're exclusive to Netflix, that's why Netflix is putting big money down for them. If people could get Netflix content elsewhere, Netflix wouldn't pay money for it, and Netflix subscribers without cable would feel cheated out of their shows if they moved. Not a good look.
24 Hours of Content, right?
- Two Marvel films per day: 6 hours
- Twelve Cartoon episodes per day: 6 hours
- "Prime time" shows: Agents of SHIELD, Agent Carter, lots of new series: 2 hours
- Commentary/Superhero Talk Shows: 1 Hour
I can only really pull 15 hours per day, and that's with them making 6-10 brand new shows, which is incredibly expensive for superheroes vs cooking or looking at homes or anything reality-based. And that's not considering that the number of movies available is limited, and doesn't change much from quarter to quarter, and then you've got issues with using Fox and Sony's content. Universal still has some distribution rights I believe as well.
Even a full all-encompassing Superhero Channel could be under some real difficulty, all complicated by the fact that people can get superheroes everywhere, especially online and superheroes on its own doesn't allow for very diverse content.