I very much approve of this line of thinking. If it’s accurate, then we don’t need to find the actual conversation to narrow the options quite a bit.
Anything on the forefront of the fanbase’s mind must have had to do with either DOS:2 or BG2. I’m guessing the conversation was half “will you fix this issue that DOS:2 had?” and half “will it be like BG2 in this cool way?”.
My guess is that the first announcement mainly rekindled fond memories people have of the previous Baldur's Gate games. So that would mean that among the first responders thoughts like 'will the next game have feature X that I liked so much in BG1 or/and BG2?' would have been prevalent. The Boo/Minsc beans have already been spilled. And Drizzt can't return because I killed him for his sabres, that was years ago. What else could it be?