Ray Tracing is the future, we know that (well, maybe even Path Tracing) but we are far from being there 100%. Games are made with rasterization in mind, first, period. Until games are 100% from the ground up a "tracing" game, and until video cards can run it in the midrange, it won't be but a niche of a niche thing, simple as that. Remember, the first batch of "Ray Tracing" in games is a hybrid method, and it only Ray Traces things like shadows and reflections. It doesn't Ray Trace the entire everything just yet. It's not fully Ray Traced, it's hybrid, and it's contained. So we are far, far off from truly Ray Trace engined games.
I'm glad the hardware sorta exists now, someone has to get the ball rolling, but one should not expect this to go mainstream for many years.
I don't think we well ever get "pure raytracing".
I think a Hybrid approach is better, rasterization is better and faster for most things, and RT is the best for lighting. Thing is, "Pure Raytracing" is still orders of magnitude slower. Even when rendering time has been cut from days to hours to minutes. Brute force is just not going to cut it.
I think AI will have much more to do in the coming years accelerating both rasterization and RT. I mean AI is already capable of creating lifelike images from "scratch". So eventually we may not even have rasterization or RT at all, just AI.