It's going to be at least a solid 3-5 years until one can say "now that we have real-time ray tracing" as far as most consumer devices are concerned, and even then it likely won't mean that all games will use raytracing for all rendering - more likely just for select special effects etc. I wouldn't give it less than at least a decade or two before we can have a mainstream fully raytraced game; and even then, I'd guess that good game artists will keep using smoke and mirrors to make effects even more stunning than what they can make by the brute force ray tracing approach.

There are a few indie devs trying to make "finer resolution" Minecraft; e.g. https://www.youtube.com/watch?v=VQv1OEm_www