With the sharp edged Le Mans style gravel rocks I'm not sure if adding these gravel traps are really that much of a safety improvement - LM already sees (much) more flat and blown tires than other tracks and having one going down in one of the many high speed section is not something I'm looking forward too... Maybe that new Motorsport Safety Foundation can look into it?
In my opion LM is already up to FIA 1.5 grade...