Agree with this completely. The Model S may or may not have an Achilles' Heel w.r.t. protection for the battery pack from road debris. Color me overly dramatic, but, for the sake of keeping Tesla's momentum going - if not for pure survival - it behooves Tesla to do
something about protecting the pack further. The NHTSA crash tests did not obviously include anything that hit the battery pack from the bottom directly and all side/front crash tests were dealt with successfully courtesy the steel frame for the pack.
In my conversations with folks (some understanding ones and others not) about the car now, some of the smugness is gone
and a slight bit of embarrassment is setting in.
I'm watching the road like a hawk now to avoid any debris, big or small, having run over a narrow but long piece of wood with my right wheels right around the time of the Kent, WA fire. As an owner and a stockholder, I'd feel comforted by positive action by Tesla; all the statistics and comparisons with ICEs dealing with road debris may be beside the point at this stage.