To my (limited) knowledge, Larian and Divinity: Original Sin was made on a small budget, from a growing and fairly new studio and developer.
BG3 was a much larger budget, able to be made from their original success from Divinity's OS1 and 2.
They made a decent amount from BG3 and thus the new release of Divinity next year, SHOULD give Larian a much bigger budget and a lot more versatility as they move away from the very limited scope of the D&D and Baldurs Gate universe and heavy constraints.
I don't know just how much truth is behind all of this, but I believe Larian MAY be considering a huge overhaul of the way Divinity is done, taking the best from BG3 and leaving behind the limitations.
HOPEFULLY making Divinity much bigger and better than ever before, and hopefully superseding BG3 exponentially.
They will have the kid gloves taken off and be able to use a much larger budget, have a lot more freedom, and thus we stand a small chance of getting a huge game with tons of great content. Or at least a lot of potential and room for expansion.
A hybrid taking all the great aspects of both, with a lot more freedom would be great.
BG with an open ended sandbox type story or Game + mode, with new species, characters, creatures, customisation and character changing options, new companion options and just a lot more depth to the areas BG3 lacked, would be incredible, IMO. Moving away from the heavy restrictions and lack of customisation.