The problem with SON is there's too much colour given off in the red, orange, and yellow end of the spectrun, and these colours at night have the effect in humans of inducing dopomine to be released into the bloodstream, making you feel more tired... if you're driving some distance at night the last thing you wants is lights making you feel tired.On the flip side of that the newer white lighting is said to disrupt sleep patterns of local wildlife, so it's worth noting the possible detrimental effect it can have if it's widely adopted.
Personally, I don't care much for the possible demise of SON. I don't particularly like it. It's not as efficient as SOX and the quality of light isn't
that much better. In an ideal world I'd like to see warm white LED lighting used in towns, cities and minor A and B roads and SOX used for the big roads and motorways. It's simple, it puts the good quality light sources where they're needed and appreciated, and puts the most efficient kind of light where it's needed. If someone is that much on the borderline that the yellow light of SOX is sending them to sleep, they shouldn't be at the wheel anyway!