Analogous to auto safety? Engineering and legislative changes made big impacts on ER casualties in the 70's: dui plus seat belts/airbags plus improved ski boots/bindings resulted in quieter Saturday nights for orthopedic surgeons and er staff. Next steps would HUI (hiking under the influence) legislation, Official rucksack with pre-packaged survival gear and plbs, and increased ranger presence. Eventually, drone surveillance will solve lots of the problems. Maybe a harness on each hiker with high strength monofilament tethers attached to powered reels: at the end of the day, fire up the diesel and haul 'em in.