True and not true. You don't talk about something unless a good number of people have enjoyed it. All famous series ARE famous because to many, at least at that point, the series was good and worth talking about to others. If it's something that is not good, why would people talk about it other than to tell someone "Don't bother watching it".
The article seems to only reference the decline of physical manga volumes and it seems to never reference the sales of the digital versions, which we can assume are on the rise as of late. It make more sense to at least give that point of reference also why would the falling physical sales have a connection to piracy when Yoshida stated that manga piracy has been around for a long while and just now its affecting sales seems a bit weird to me.
An anime adaptation for any series is a big deal. WSJ isn't some special tower for anime producers. Most WSJ anime don't even do well in BDs and rake in revenue through merchandise, manga and games. Its a fact that BD sales are still an important source of revenue for producers especially the disc makers which usually tend to be on top of the committee. OP. DB, Naruto and the like should be excluded due to the fact that they're systems are set up differently and are household names. BDs are an irreplaceable source of revenue for current anime, even for something like BC, a daytime series which most probably will not sell well.
You like the idea of bringing up a manga from a different publisher and a smaller magazine that is doing well and you also like to leave out big details. Why bring up Slime? That also had a super popular LN first and it started as a web novel. Slime is a monthly manga. How many big hits do Shounen Sirius have in comparison to WSJ?
It always affected sales, but you cannot measure something you are not in control. A study has to be made about how much impact piracy has in sales and publishers probably have such studies, but they don't disclose to the public, of course. It is a fact that it impacts, there are people who read in pirate websites while the manga is not published in their country and after it is licensed they buy it, great, but there are also people who don't do that and continue to consume pirate content even when there are legal ways to read, so less one person that could be buying, but is not.
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There have been manga that have sold just as much or lasted just as long if not longer yet still didn't get an anime. Psyren and MxO come to mind.
Both of those are from 9-10 years before Kimetsu even started. Different times. Even HZ got an anime. If there's anything that will delay anime adaptations it's the fact that animation studios are currently booked for years with anime productions.
It got an anime announcement, 3 1/2 years after the manga started, and so far there is zero information about the HZ anime. It could air at the end of this year which would make it 4 1/2 years after the manga started.
Eh, if you say so. I'd say it's more than certain.
Considering how busy and booked animation studios are right now until 2020, maybe that will happen, who knows. We have information about the HZ anime, that it will adapt 17 volumes of content, which might mean that the wait was longer because they wanted to adapt a lot of content or the first part of the manga, but who knows, we can only speculate.
But even if it was really a problem?
Yeah, looking at my list, we could have surprise random announcements for Kimetsu and Neverland anytime this year. Kimetsu has 97 chapters and Neverland has 74.
Do they typically do that? Do things work like that? Even if they announced something, it would take at least 6 months until the shows actually aired.