Hiya!
As I said in another ToEE --> FR thread...
Being a DM with a more or less 'constant' running of GH campaigns since I picked up the Folio way back when...I must admit I did get that sharp little pin-prick of nerd-rage when I heard this. Then I took a deep breath and thought about it a bit. I came to the conclusion that, yes, I'll just have to deal with being a bit annoyed at WotC's missed opportunity to introduce GH to a whole group of new players...and also to *maybe* convince some old 1e Greyhawk Grognard (mostly over at the Canonfire! site) to give 5e at least a little bit of a cursory glance.
At the end, I suggested a compromise: Set up this ToEE as a sort of "ToEE : The Resurgence". I suggested that if the writers took it as gospel that the "first" ToEE started in GH, and was eventually laid low by heroes there, sending the "big-bad guys/girls" (no spoilers) and the "nodes"....not straight to the Abyss/Oblivion...but to the FR! Slowly acclimating to this "new world", said BBEG/G start up their shenanigans in this "new and unsuspecting Prime Material Plane". So, *this* ToEE, the Forgotten Realms 'version', is basically a new base of operations for the Elder Elemental Forces. The writers could more or less keep the core tone, deadliness, etc. of the original GH version, but with new maps (based on the old), new NPC's (inspiration from the old), etc, etc, etc.
This would keep the "original ToEE" free from any FR-tint, and allow all of us who have already played or DM'ed the original to be surprised and excited about a new "version". The outright stating (probably in the background) that "The First Temple was on another world. A world called Oerth". I guess you could equate it to the original 70's Battle Star Galactica with the newer 00's Battle Star Galactica. Same overall base and whatnot, but just a 're-telling in a different way'.
I'd be totally down with that.
^_^
Paul L. Ming