I note that the Japanese CAB is now on a course to investigate making light aircraft safer, after a recent spike in light aircraft accidents in Japan.
They are going to examine the potential of the fitment of (cheaper) CVR's and FDR's to light aircraft - as well as looking at the potential of fitting airbags to same.
As many light aircraft crashes are quite often relatively low speed crashes, perhaps airbags in light aircraft do have some life-saving potential.
I trust the Japanese proceed with their ideas, they are very good at perfecting others ideas, or transferring technology from other fields to additional uses.
Maybe they could go the whole hog, and upgrade the 172 to some current cutting-edge technology, while they miniaturise everything at the same time!