I don't really have a problem with the 3, and to be totally clear I'm someone who played the originals on release, didn't care for DOS and skipped DOS2 (played the first hour on a ps4 and hated the control scheme, I realize that isn't a fair shake). In my opinion the story was an important aspect of BG but not a majorly important aspect. That said, I also do wish that Larian hadn't gone with the 3. It gives them more flexibility and freedom, while still meeting the (realistic) expectations of some of the old school fans like myself. It's pretty clearly a money grab in the era of sequels.
I like a previous post where it could be titled something like BG: <insert title here> so that you can communicate that this is something happening in the same universe and that fans can expect a certain amount of similarity between the two. Wasn't the story finished by the end of ToB? What was the canon ending?
All in all, I feel like the fairest and most balanced thing to do would be to wait for the game and then judge after that.