It's not a matter of regulation, it's a matter of going through all the steps necessary. Up until now this was merely an idea. As the article states, they have only just now published a paper that "...shows early promise in ray tracing microbenchmark studies.". If you look at the paper
, you'll see that the test data comes from a simulator. This is a proof of concept, they managed to show that the design changes they propose could improve Ray Tracing performance by an amount singificant enough to be worth pursuing.
NVidia is likely to follow on this because Ray Tracing performance one of their top goals, if not the first one. What this means is that they will now have to evaluate the effect these changes will have on the rest of the featureset and then design and produce prototypes. This is likely to take a year on its own. After this is done, they have to integrate the design into the next architecture. Finally, once all that is done, there's the matter of allocating and ramping up production, which requires billion-dollar deals with third parties (Samsung made the 3000 family GPUs, TSMC will make the 4000s).
The only reason I say this might be in the market in 2 years is that NVidia is avid for this kind of improvement. Otherwise 3 to 4 years would be more reasonable.