I however do not believe that there is a contest to win the setting championship and be The One. I believe the D&D hobby can support multiple settings, even multiple WotC-published settings. (Indeed it current is).
And my stance is that a setting not attaining eternal publishing is not a qualification of a “complete failure”, especially now as no one is even asking for that right now. Much less “dethrone” FR in a dumb face off. You’re pulling that out of nothing.
You seem to have made up something I didn't say, which rather supports my partisan point, I'd suggest.
What I said was that
the attempts to make Greyhawk happen were, individually and collectively, a complete failure. That's not the same as
the setting itself being a "complete failure". That's a very different claim and not one I would make. If your intention is to make a setting worth publishing official material for, in terms of popularity, and you fail at that, I believe it is absolutely fair to call that attempt a "complete failure". Don't make up stuff like "eternal publishing", it's not helpful. If they'd managed, in 3E, for example, to even make GH popular enough to be worth publishing a line of GH setting books for, even if it didn't make it to the end of 3E or into 4E, that wouldn't be a complete failure, or necessarily even a failure, just a limited success. But they didn't manage that.
As for "dethrone", if you don't think when they launched 3E, they were envisioning dethroning the FR and replacing it with a resurgent GH, well, I respectfully disagree. I feel like they even said something to that effect, but it was 20 years ago so who knows. However because they got absolutely zero traction, though, they just went with making GH the default lore for D&D in 3E.