Game devs are not interested in making games that no one will be able to run. Regardless of the benefits of raytracing it is currently inefficient when compared with raster tech currently on GPUs. Hardware tessellation makes inefficient voxel tech moot except for scientific purposes. We can already stream data from the hard disk to the system ram into GPU memory.
I'd put mainstream voxel/raytracing tech as more like 10 - 20 years in the future.
I'd put mainstream voxel/raytracing tech as more like 10 - 20 years in the future.