I have just never seen what of Greyhawk makes it worth bringing back for new players such as myself. The primary thing that I think matters with a Fantasy world is its aesthetic, which enabels and flavors the stories in that setting. However, the aesthetics of Greyhawk are really just generic Fantasy Aesthetics with a likewise generic Dark Fantasy twist. While in the 70s and 80s, the idea of Greyhawk was still fertile, and S&S + Dark Fantasy was a relatively young genre. But in 2022, what does Greyhawk offer that other settings don't?
I'm not a fan of the Forgotten Realms, but I don't see how I couldn't do literally anything and everything in Greyhawk in the Forgotten Realms, or even better, as a homebrew product. And when I look at 3rd Party, this aesthetic is covered by Kobold Press, Midnight, Symbaroum, and so on. So why would I, as someone who has no nostalgic connection to Greyhawk, want to play it when literally before I was born the idea was already stale, and has only gotten more stale with all the innovations in the genre sense.
Now, if Greyhawk returned back with a grunge punk vibe, and really played up the dungeonpunk aesthetics or really just did anything, literally anything other than white people in armor and elves drawn the same way they have been for 40 years, I'd be excited for it. But as it stands, Greyhawk is very much a generic Fantasy setting that offers new players absolutely nothing interesting at all that other settings don't offer (alongside their own stylish variety).
This isn't to take a crap on Greyhawk btw. I'd quite like to see a beautiful Castle Greyhawk adventure that really blows my socks off, or a modern take on the Caves of Chaos. But if all that is being proposed is just more of the same Greyhawk, well, I don't think there is enough market interest for that to be done.