Excellent point! It's not just the reduction in space for the human passenger, but also a reduction in weight and resource usage from not needing (as much) safe

Excellent point! It's not just the reduction in space for the human passenger, but also a reduction in weight and resource usage from not needing (as much) safety features on the vehicle. I'm guessing this would also make the cars safer to crash into, or be crashed into by, given that passenger cars would continue to be heavier and sturdier.