This proposal makes much more sense than Apples "Metal Only" solution (https://webkit.org/blog/7380/next-generation-3d-graphics-on-...). I liked Metal at the beginning but over time it turned out that it is just another OpenGL/DX flavor with the same old driver/performance problems. Also using SPIR as IL allows the use of the preferred shader language. WebGL Next is about parallelism and abstraction, otherwise there would be absolutely no benefit.