In terms of "revamping" Greyhawk... I think their first, best, easiest and probably most accepted by the populace option would be not to "re-do it"... but simply re-print it.
Do with the Greyhawk box set (whether the first one or the grey one) what they did with the A series of modules. A hardcover book. Maybe include many of the Gazetteers inside it too. Maybe do a little bit of cross-editing if you wanted to insert Gazetteer information into the relevant sections of the box set information, rather than have them being appendices in the back of the book. Maybe take out all the AD&D stats altogether and make it "setting neutral" (and then if you wanted to, have downloadable packages of the statistics for AD&D, 3E, 4E, and Next available on the website.)
But in any case... if you aren't going to change the setting at all... there's really no reason to pay an author to re-write it. Since Greyhawk's been long out of print... just use the writing that's already there in several different old products and bind them together into a single product that you can buy now. That way its available for new players to pick up, but also is exactly how the older players remember it and would want it to be.
That's the way I'd go with it at the very least.
Do with the Greyhawk box set (whether the first one or the grey one) what they did with the A series of modules. A hardcover book. Maybe include many of the Gazetteers inside it too. Maybe do a little bit of cross-editing if you wanted to insert Gazetteer information into the relevant sections of the box set information, rather than have them being appendices in the back of the book. Maybe take out all the AD&D stats altogether and make it "setting neutral" (and then if you wanted to, have downloadable packages of the statistics for AD&D, 3E, 4E, and Next available on the website.)
But in any case... if you aren't going to change the setting at all... there's really no reason to pay an author to re-write it. Since Greyhawk's been long out of print... just use the writing that's already there in several different old products and bind them together into a single product that you can buy now. That way its available for new players to pick up, but also is exactly how the older players remember it and would want it to be.
That's the way I'd go with it at the very least.