@prologos: good point. Unfortunately, if a few lower income folks die on the road to Nirvana, it is not really such a big thing (for the big guys). That is why we always see the trickle-down effect for safety features from high end autos bought by the wealthy down to the plebes (possibly).
Disclaimer: as interesting as the technology is and the many good reasons for pursuing it, I don't think it will ever happen as envisioned. The current experiment with debt-based, global capitalism is running on fumes. I'm expecting a major reset. The depression that happened in the 1930's will seem like a walk in the park compared to what is coming. We should have started preparing for a softer landing, many years ago.