That, like fusion power, is something that has been said for decades now. I like to think it'll happen, but for now we'll probably get partial ray tracing to enhance reflections and such; full ray tracing will require several generations of graphics processing still. And even then it will depend on what resolution it has to be done on; graphics cards needed years to render HD resolution and are now again struggling to do 4K and / or VR graphics. Ray tracing will be another order of magnitude more resource intensive.