Now, do I think Wizards wants Greyhawk to fail?
Nope, I don't think that they (WotC) want Greyhawk to fail, since for it to fail it would have to be given equal chance to do so.
While the core D&D books are peppered with Greyhawk flavor, it is still not the same as the full court press of a Campaign Setting book/line, such as the Forgotten Realms Campaign Setting and Eberron Campaign setting, which includes supplemental books and not just the roughly generic adventures.
Under 3e/3.5e Greyhawk has had the chance to have successful books, but not a successful line and it has not been given the same development as the Realms or Eberron in the current edition.
What visits we've had to Oerth, thus far, though have been fine books, many are fan favorites, but it's almost like giving a dehydrated person a 6 oz. glass of ice water.
Sure, we loved it, but suddenly we want a whole lot more then you've given us.
Can I blame Wizards?
Sure, as a fan, but I've also got to give them some benefit of the doubt, too.
I don't think they're doing it maliciously, they're not out to hurt Greyhawk fans, if they were doing so then all they would have to do is just release a product that utterly, totally, and completely destroys Oerth.
Period.
If, in canon, Greyhawk was destroyed, forever, then they don't have to do anything with it, as it's a dead setting.
Obviously they haven't done that, so obviously someone, somewhere, at sometime will do something with it.
I've stated my hopes, more than once, of how I'd love for Paizo to get Greyhawk, but I'm loving the Pathfinder Chronicles right now, so I'm okay waiting for Greyhawk's next hurrah.
While I don't think that Wizards wants Greyhawk to fail, I don't think they've given it a chance to succeed, either. The peppering of Greyhawk flavor in core books, supplements, and adventures is still only a fraction of the fluff/flavor text that Eberron and the Forgotten Realms has had, it's simple to see.
Semantics aside, they've not had the same chance, in 3e, as Ravenloft and Dragonlance has had, either.
But, what we have had in Dragon, Dungeon, and recently the Expedition to the Ruins of Greyhawk have been downright awesome, so my patience is earned.
For now. *grins*