If SVG is ever to be allowed, I feel like there has to be some restrictions put onto which parts of SVG specs are to be allowed. There is already a very big problem with consistency of implementations of it's parts, even in some big software, and I have no doubts the problem will only be exaggerated with the solutions different implementations of LDraw renderers will run into
Also, with any such extension to me a problem of backwards compatibility begins to look worse with each time. Realistically, this would only enlarge the number of parts that would be effectively unsupported with each such change. Unless the change is going to introduce big improvements to either part making or ease of implementation (which I don't really see this proposal really doing either of the two), I'm not gonna be very supportive of it
Also, with any such extension to me a problem of backwards compatibility begins to look worse with each time. Realistically, this would only enlarge the number of parts that would be effectively unsupported with each such change. Unless the change is going to introduce big improvements to either part making or ease of implementation (which I don't really see this proposal really doing either of the two), I'm not gonna be very supportive of it