Tempted to add the truth tag, this being an accurate depiction of how most artists treat Ellen-sensei.
There are more 12 pages of Rating:Safe pics of her as of now compared to the 6 pages of other stuff. 61 Pages of non R-18 stuff on Pixiv versus 12 Pages of R-18 (though, it works a slight bit different on pixiv and you can have somewhat sexually natured pics not tagged with R-18, the difference is still vast enough to make my point). So while it is a funny thing to remark on, it is in fact, not true. People just have a tendency to take more notice of porn than non-porn and it feels like a lot of people are vastly overexaggerating just how the otaku community views the character.
They don't JUST want porn pics of her, they're doing the same thing they always do with their flavors of the month, they produce a whole lot of varied content for the character and that content inevitably contains some porn. That's it, there's nothing particularly out of the ordinary about this beyond the fact that the artist kindly politely requested they take it down a notch on the percentage of porn.
Nothing wrong with people wanting to take the artist's side since otherwise the books might get into trouble, but there's no need to vilify the otaku community and treat this as if they're all purposefully drawing with one hand and fapping with the other either.
Again, 「エレン・ベーカー」 tag is 1352 count in PIXIV, from them only 225 include the R-18 tag. That's only 16% of the artwork. But somehow some users assume 100% of the artists do R-18 all the time only to see the world burn. The trend will reduce even more once the next popular character comes in, then it will be forgotten to oblivion just like all those Hatsune Miku hentai.
So please, don't be fatalists about books being retired from market or no more cute characters on educational books ever. That's as ridiculous as believing all those Dora the explorer and My Little Pony hentai mark any difference about how children consume such products.
You're both overgeneralizing things again, you think the preference in likes towards porn reflects the otaku community? If you've ever been to tumblr or deviantart or anything similar, you'd notice it's not a trend specific to just otakus. Porn in general is just more visible and catches more attention than not-porn, that's all. Seeing this as an exclusive trend of the otakus is just you using it as support for your arguments while ignoring other places it happens in the art communities, which is a big mistake. The problem isn't limited to otakus as consumers, it happens to nearly ALL CONSUMERS when it comes to art. Breaking through the porn 'easy to catch attention' barrier isn't easy.
The otakus aren't the only ones drawing that porn, they are generally a big target for that porn, yes, but even the regular art aims for them too and that porn isn't only consumed by pure otaku either. That they don't give said art as many likes is mostly only a reflection of what I said before, that porn just attracts more buzz versus not-porn by default. Otakus are considered deviants in their society not because of their focus on porn, but because of their obsessions and seeking to classify all otakus as 'Porn Otakus' is like saying that anyone who plays video games 'Plays Shooter Games'.
You need to learn how to differentiate between what actual problems are unique to the otaku and which are things that just happen in general, otherwise, arguments just devolve into unfocused messes.
The Ellen Baker thing is just a result of the otaku taking a temporary obsession in one character for a bit, a mass amount of media being made of her in that time, some porn being made as well, people taking more notice of the porn than the other stuff because that's how it usually goes and then the creator asking people to take it down a notch with the porn because whatever porn was there was starting to worry them. The only thing the otaku are honestly guilty of is putting the spotlight on her in the first place, but even then, whoever did it couldn't have guessed she'd be chosen as Miss April 2016.