I think it is no longer so much in vogue as it was 10 years ago.
In the 1980s, Dune and Mad Max were popular so Dark Sun was most relevant. There were also Saturday morning cartoons then and so Dragonlance, which very much had the feel of one with very cartoony characture races and a strong overall metaplot, was very much relevant. Mystara seems to have been inspired by adventure movies like the Goonies and Indiana Jones, and was most themed to explore forgotten areas of the world more than any other setting (it was also the setting for basic D&D, so the setting, like the system, was fairly simple.) The samurai craze of the late 1980s to mid 1990s is what prompted the Oriental Adventures setting.
In the 1990s Disney put out Aladin and TSR responded by putting out the Al-Qadim setting. When Jurassic Park came out and dinosaurs were in vogue, Forgotten Realms was sold as the dinosaur setting (once WotC took over though, the Drizzt series had taken off and the setting was rebranded). There was a monster/vampire craze from the late 1980s through the 1990s which is when Ravenloft was most relevant, and that was also the vibe that the World of Darkness games picked up on.
The 2000s was when Steampunk, Noir and Mystery were most in vogue, so that's why Eberron was chosen to be the "new D&D setting" near the end of 3.5. It was also the era of peak the MMORPG which is why Nentir Vale was created the way it was.
Pretty much every D&D setting was a response to the cultural zeitgeist at the time. It is actually a bit odd that 5E decided to go back and revisit a number of these instead of reacting to what was in the cultural zeitgeist for the 2010s. I would have thought for sure we would have gotten a proper pirate setting. But, I suppose, because 5E from the start has been an over-reaction to people rejecting 4E, the team decided to simply cater to the older fans instead of creating something new.
And I do know that once something has been in the cultural zeitgeist during a person's lifetime, for some people that's just always going to be their most favorite thing. (Sometimes it is even something that was popular for their parents and so their parents passed on a bunch of stuff to the kids.) I probably wouldn't go as far to say that any of these are entirely passe and not worth engaging in-- but its just that the peak has sort of passed by.
So I hate to break it to you but your causality is so mixed up it’s painful. I can only assume your references were based on a hunch as even a cursory look at dates show this is wrong.
Mad Max was 1979, 81 and 85, Dune was 1985. Yet Dark Sun wasn’t released until six years later in 1991. There were also re-releases of Darksun in 2010.
Al Quadim was released in 1992 whereas Aladdin wasn’t released until November that same year... even faster writing!
Mad Max was 1979, 81 and 85, Dune was 1985. Yet Dark Sun wasn’t released until six years later in 1991. There were also re-releases of Darksun in 2010. Without any more Dune or Mad Max.
Jurassic Park was released in 1993, whereas the saurials were featured in 1988 with Curse of the Azure bonds and Chult’s dinosaurs were detailed in Ring of Winter 1992.
Hammer Horror films ran through the 50’s, 60’s and 70’s, and horror is just as popular now as it’s always been. Ravenloft was first published in 1983 and has existed in some form or other for every edition bar 4th.
The samurai craze of the 80’s and mid 90’s? Crouching Tiger 2000, Hero 2002, Last Samurai 2003, and House of Flying Daggers 2004 are the biggest historical/fantasy films featuring East Asia in the last 40 years as best as I recall.
Eberron in 2004 was influenced by Pulp Noir, among a wide range of things. Some of the influences were mentioned in 3e campaign setting book... the one I always remember is The Maltese Falcon (1941) Steam punk had been going strong since the late 1980s with studio Ghibli and a host of novels like Infernal Devices. So saying that it was a 2000’s steam punk craze that made Eberron popular is odd.
It’s not that you’re wrong that D&D is influenced by culture. Of course d&d is derivative, but you’re just plain wrong about the simplicity of the influences. There is a huge body of fiction, myth, art, tv and film that have influenced d&d. Some of it like the Arabian Nights, The art of Brom, or the novels of Troy Denning, or Ed Greenwood. You’re ignoring the popularity of vintage, or the fact that as adults we often want to write about what we enjoyed as kids.
Ironically the edition most derivative of its time and dismissive of other times was 4e when it jumped on the MMORG band wagon forgetting the rich history and influences that went before it, much to the chagrin of D&Ds fans... particularly the forgotten realms. With the loss of popularity of MMORG the 4e experiment died a death. The other editions and settings seem to be eternal whereas Nentir Vale is a footnote.
I’d be grateful if you could tell me what the Zeigtgeist for 2010s is. So far it appears to be nostalgic referencing of earlier ideas (stranger things), TV of books from the 90’s (Game of Thrones) and film adaptions from previous decades comic books, music remixes, Disney live action releases. Etc etc etc.
That seems to be exactly was WOC is doing now... sounds like a good strategy to me.