While I understand fans have to share part of the blame, it's Marvel's job to make the market, the demand for their products and characters. If fans don't give characters or books a chance, that's in part due to the environment Marvel has created or supported, i.e. a book / character has to be 'important' to be 'worthy' of buying. You only have to look at what Geoff Johns and DC did with Aquaman in comparison to Marvel's treatment of Namor.
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?
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