Currently as in "before being written for 5e"? Of course not, because the last time Greyhawk was written to match a PHB and MM was 3.5, not 5th edition. However, let me challenge this. What base assumptions make the 3.5 version of the setting completely incompatible with the 5e version? I haven't found any yet. So, your #2 immediately stops. You honest opinion is your opnion, but it isn't backed by any facts.
I agree, they aren't going to have the DMG example setting be completely different than the baseline game. But... you seem to forget that there is a third option between "change absolutely nothing from the 80's" and "strip everything out of the setting and leave nothing but bare rock behind"
They can start with the setting from the 2000's, and adapt it without stripping anything out and blowing up the setting. You can believe they will fail at this, but I don't understand why you think it is not possible to do. What are these baseline assumptions that are both so baked into the setting that they cannot be removed, yet also so incompatible with the frankly generic 5e base assumptions of "be the hero, beat the villain, use magic sometimes"?
But your opnion is still based on the same thing you keep saying it isn't based on. That Greyhawk cannot be in 5th edition, and align with 5th edition PHB and MM assumptions. But you haven't shown why that is. You just keep saying it.