I think Forgotten Realms has a special place in many people's hearts (especially the millennials and around them), being a formative part of our childhoods: Minsc and Boo, Drizzt, beholders, mimics, etc. It's like Star Wars or LOTR, people get attached and emotionally invested and it's not so easy to let go overnight.

I enjoyed the Original Sin series and played them for many hours,but never finished either one. The characters and stories weren't their strong suit IMO (they were kinda cheesy, honestly), but yeah, tactically they played better than BG3. That's the downside of trying to accurately transfer tabletop mechanics, I guess, and combining it with the poor UI of the BG3 series (too many different types of actions and reactions to squeeze in the toolbars). Anyway that's beside the point.

I agree new IPs would be great, but those are rare! It would be cool to see an open source fantasy world where high quality fanfic could be curated into canon.