Johnny Storm was dead; who is this resurrected Johnny Storm?
"Here, hold my Annihilus…" Johnny Storm, Fantastic Four #601
Namor's last ongoing was really the only one of those titles that was focused on creating a story for Namor, and it's no surprise it didn't get any traction. It had an unknown writer, art problems, alienating fans, no 'importance' in the MU or even in the X-Men corner of the MU, poor support, etc. -- exemplified by Axel Alonso mentioning the book in passing as a one-shot for Curse of the Mutants in a Cup of Joe.
Sub-Mariner Revolution was focused on Namor also, but it was really just set up for Bendis' Cabal -- which ended up doing little, either as a group of individually. It actually reminded me of the '84 mini, which was set up for Namor joining the Avengers.
But Namor hasn't shown up in any cartoons since Fantastic Four. His last game was Ultimate Alliance, and he's not part of the recent Phoenix Five addition to Avengers Alliance. But they do still make toys and statues -- while Namora and Namorita have even less / no appearances outside comics.
And Namora's appearances, with the exception of Parker's Atlas, certainly weren't about pushing her, either.
I do have to wonder, how much of Namorita's limbo is due to the false perception that she and Namora are similar?
Waiting for Moon Knight's return in March 2014 and Ollie's goatee...eventually.
Marvel definitely could have gotten a bigger sales draw from a Bendis or Brubaker instead of Stuart Moore which is not to say that Stuart didn't try to put his best foot forward to make the title succeed but there's only so much you can do for sales when you're not as much of a known quantity. Still, I think Marvel tries to push the character wherever they can by including him in the Illuminati/Dark Reign stuff and events such as with The Deep during Fear Itself and I think he tends to shine in either guest appearances or in team settings. This is the first time I've seen Namor feature in an event as highly in profile as he has in AvX although I understand your frustrations with the limited amount of coverage that they gave him.
Media wise I agree about not using him more either as I would have liked to have seen him in the Avengers cartoon or in more videogames at least. Namora's kind of a different case in that nobody really expected nor clamored for her when she first came back as I think Parker had come up with some far fetched comebacks for some of the AoA but I'm glad she was able to be used as prominently as she has so far as I've become a big fan of the character and loved the addition of her into the Namor "family" if you will.
You got me on the Namorita/Namora thing though, I've been wanting to see them reunited ever since we saw Namora mourn the loss of Namorita during the Civil War stuff.