If these things actually made a difference wouldn't vehicle deaths be falling unless some other change is offsetting the difference?
FTA:
"Many studies and observers cite the rise of mobile devices and their growing role in our lives as a possible cause behind the recent spike in traffic fatalities."
Anecdotally, in my area, teens often receive the current family car (which is often 8+ years old), or one of the families secondary vehicles. Then another vehicle is purchased for the parents, often new or a recent used vehicle. So the vehicle with less up-to-date safety options goes to the family member that is the least experienced driver.
Today's car may have collision avoiding systems, which could protect pedestrians.
I've been driving for 30 years and haven't had an accident in over 25, and I can tell you: I love these features. The blind spot detection mostly offsets the poor visibility on the new car, but the other features are really helpful.