How about disposing of or recycling the harsh chemicals in these new batteries. I don't think we need another nuclear waste storage problem, as manufactured as that is.
My brother in law is a Miami fireman and he says they already have warnings about containing anything leaking out of a Prius or Insight if involved in an accident.
I can see it now, starring Jane Fonda, an almost impossible random accident involving a Prius and an Insight. Crashing aluminum, magneseum, steel and unobtainium battery chemicals. Blah-woooosh, The Japan Syndrome!