Since when are Dragonborn a "Forgotten Realms" race? Heck, people freaked when they added them to FR too.
I guess that's the part that baffles me. So much of Greyhawk is left blank, even today. There's huge areas of the setting that have never been detailed or are only very sketchily detailed. Plunking down a "Dragonborn nation" wouldn't cause the slightest ripple in the setting.
To me, the whole "let's hit the reset thing" just throws the baby out with the bathwater. Maure Castle? Shackled City? The Demonomicon series? Iggwilv? And a host of other stuff that is pretty darn good.
I mean, if you want Baphomet, Paizuzu, or most of the demon lords, they don't appear in D&D until after 1983. I would argue that Cauldron and Sasserine are just as iconically Greyhawk as anything in the Boxed Set. Resetting to 1983 is just the grognard way of forcing everyone else to play the way they want. Why should everyone else be forced to do all the work adding material back in just because you folks happen not to like some of the changes done to the setting?