Papageorgio
The Ultimate Winner
That's unlikely to happen. Unless there's a breakthrough in materials tech that makes carbon fiber and the like incredibly cheap.
Besides, the focus is now taken away from these lighter expensive materials, aerodynamics, and engine efficiency performance and puts it squarely in the lap of electric or hydrogen vehicles.
And this is exactly where Obama wants it. No more hydrocarbons.
Is it worth the extra loss of life or greater risk of severe injuries?
Why do you assume better mileage cars will be more dangerous?
Because they will need to use lighter parts to get better mileage. Less weight, better mileage.