I'd only pick up BG3 again if they added a major new expansion.
I would honestly be surprised if they did this as it clearly wasn't planned. If I had to guess Larian has likely moved onto their next game. With Divinity Original Sin 1 and 2 they fairly quickly moved onto their next projects.
UNLESS someone is able to make quality standalone modules that implement some cool 5e adventure (as long as those also include fixes for Larian's very messed up 5e implementation).
I'm very optimistic this will happen assuming we get custom environment support. Neverwinter Nights 2 had a team full on remake Baldur's Gate 1 and Icewind Dale.
I am very curious to see how sophisticated and complete the modding framework will actually be
You and me both
I'd love levitate and proper fly (with hover, as in Solasta), for modded spells. I suspect that is an engine limitation though.
I suspect you're correct. The engine is likely very buggy when it comes to moving in the Z axis. Divinity Original Sin 2's engine heavily relied on a pathfinding grid for characters to move. You had to generate this otherwise your character would be stuck in place.
I suspect Baldur's Gate 3 runs on a very similar system however they likely created a hacky method for letting players move from one grid to another for things like jumping. It's also likely why the player freezes in place when you go onto elevators as it's likely they never implemented moving AI grids.
AI grids like this are also not uncommon in rpgs of this style. Dragon Age Origins operated off of a very similar system.