What D&D actually needs most is Neverwinter Nights 3. Toolset, DM client and endless possibilities. NWN 1&2 are way too dated now.
This really, NWN was incredible for it's time (and still is). The accessibility of the toolset while allowing for complex systems and the ability to have persistent worlds with DMs made it truly shine.
As for the topic itself:
A potential BG4 would have to get of origin characters and adhere much closer to the actual rules.
