I would prefer to have something like Icewind Dale, a story that target a region of faerun with normal characters avoiding the epic world wide conflict that you see in BG2. ToB was already a bit too much, it would have been welcome to end the plot with Irenicus. I don't see a BG3, but rather I would prefer a sort of Advanced Infinity Engine, keeping the same spirit of IE but with better graphics, avoiding at all cost 3D.
See how big is Faerun you could make a trilogy in each region The never ending engine
But ok i know it's not gonna happen, better stick to the modding community.