For those complaining about riding into their own shadow, a dipped beam won't really help with that, unless we simply mean a beam (whether of cut-off type or not) no longer aimed very far up the road.
I think we can all agree that lights for all kinds of vehicles are brighter than they used to be, all with the capability of inducing a certain degree of dazzle. Dipped beams in cars seem brighter and, of course, a significant proportion of these will be adjusted too high, or spend time going over bumps or cresting hills. Plus a significant number of drivers will also use main beam indiscriminately. That's not even mentioning daytime running lights which are now mandatory, come from small light sources, and are frequently used beyond pure daylight conditions.
Yet, despite all this, the evidence suggests that - for cars at least - the roads are a safer place, with fewer collisions. See: http://road-collisions.dft.gov.uk/
The gradual decline in collisions or accidents resulting in slight casualties suggests a general shift in population, as older groups are replaced with newer groups through natural attrition, rather than a sudden event such as a change in law. I would believe that it's the car models which are being replaced over time, with some aspects of newer cars helping to reduce accident rates. Numerous innovations could be credited with this positive trend, but it's clear that increased and brighter lighting has at least not caused the accident rate to rise.
Of course, if the trend is not down to the gradual turnover of vehicle models, the only other significant population seeing turnover would be the drivers - so some might choose to believe that we have been shifting from a generation of accident-prone drivers to newer, more considerate and careful drivers...