I am not in a Ravnica game right now, but it is pretty trivial to find people talking about their Ravnica games out there. Out of the 40 million people into D&D right now, some percentage is playing Ravnica, and I'm sure WotC has some data on that.
I just wonder what the percentage is. Is it 5%? 1%? 0.1%? 0.01%?
As for "trivial to find people talking about their Ravnica games", I've been searching for actual play threads/podcasts featuring people playing Ravnica
now, but I wasn't initially able to find any at all. I found a number of ended campaigns from 2019, and a cool-sounding podcast, but that was also over.
I did find a subreddit for Ravnica for D&D, which whilst not super-active, is a bit more active than the Dark Sun subreddit, so there's that. Still, you'd hope so, given Ravnica fans are probably 10-20 years younger than DS ones (and thus vastly more likely to be on reddit. That's literally the only place I could find, but its something!
The DS subreddit being so much more active than the Greyhawk or Dragonlance ones (I mean, you'd kind of expect this, DL/GH players are probably mostly 45+ and thus less likely to be on reddit) does help explain why WotC might be so keen on it. Not because of the subreddit, obviously, but because they have data suggesting Dark Sun has a lot of people interested in it.
This also suggests, to me at least, something pretty interesting - that a setting featuring in official products is very important in getting that setting
to a younger generation, and keeping that setting alive long-term. Why do I say that? Because I strongly suspect that if Dark Sun hadn't been a 4E setting, then it wouldn't have a subreddit nearly populous as the Ravnica one. It would probably still be less dusty than the GH/DL ones, but not that active.
So that, for me, bolsters people's arguments that older settings "should" get some kind of official release.