Not sure what your grim statistics suggest, other that the dangers of "Football" have been a serious concern for decades. Rules and tactics have been consistently reviewed, adjusted and altered since 1931, and will likely continue to be adjusted going forward as the game itself continues to changs, intensify, progress and continue to provide a safe environment for competition interested in by players from pre-teen to seniors.
Unfortunately we have yet to reach the absolutely PERFECT requirements to erase ANY and ALL possible threats, but THAT EFFORT continues. The serious effort to continue removing ALL hazards from participation continues, and has progressed significantly since your stated time table (1931). God willing those efforts will continue, as will the constant progress the sport has enjoyed since 1931 in achieving (doubtful} "perfection.
The basic mission continues, ever increased removal of unintentional consequences that threatens participants, at each progressive level. Thankfully, the sport has progressed, substantially, since 1931, but as seems ALWAYS the case, has yet to reach ABSOLUTE PERFECTION. However, the "chase" and search goes on. do you have any practical, tangible suggestions?