A while back I was looking through my client's files(can't remember if v5 or v6) and found an empty "3D" folder or something like that. Not sure wether that means there is leftover code or whatever that could still allow for a 3D server or if that's where such code would be found if it wasn't cut.
Personally, I think Stefan should pick back up on the project. I see nothing in its way nowadays, and I'm sure eventually some pretty good 3D servers would be made.