Gamebryo is a great engine, it would be a shame Larian threw away the expertise they build with it for a new engine.
Only if Gamebryo (lightspeed) has come obsolete by when a new Divinity is developed, only then changing should be an option. If it were up to me I'd choose for Cryengine 3 as it's proven its worth rendering natural enviroments.
As obvious here:
![[Linked Image]](http://mycryengine.com/images/gallery/Dynamic%20Volumetric%20Light%20Beams%20and%20Light%20Shaft%20Effects.jpg)
![[Linked Image]](http://mycryengine.com/images/gallery/Volumetric%20Layer%20and%20View%20Distance%20Fogging.jpg)
Plus it runs on even my years old rig at decent settings.