Why wouldn't BYOND -ever- support 3D graphics?
If BYOND was 3D then it would the language that much harder to learn. So you might as well use C++ if you really want to make a non 2D program.
At least one BYONDer I know is working on a 3D game development system with a code model similar to BYOND's. When it's presentable, you can bet there will be some news about it posted here. :-)
Even the fakey 3D like Wolfenstein would be a overall welcome addition to BYOND.