I heard about Rust OS some months ago (Is there one more than Redox). I think that is very interesting, indeed that would be my main motivation to learn Rust language deeply.
But it is very hard for new operating systems to become popular. For Linux it was a bit different, because it was only a Unix clone, so it was not necessary to develop new ideas, and some people where already familiar with Unix. Most other new OS failed. Most critical are device drivers, for which often only closed source drivers exist. Using these may be difficult, and may destroy the benefits of a new, secure OS. And developing other state of the art core components is much work, as Wayland display system, GUI toolkit, OpenGL/Vulkan support or a file system like BtrFs. And all the other Tools -- for Linux we still have no real good CAD or Photoshop, just to name 2. Of course with a good language it is a lot easier and faster, but still take much man power. But maybe Rust OS will get strong support from a very big company or government?
