There will be a combination. Autonomous cars replacing taxis and buses; light rail/MRT for the last 5 miles in dense city centres; heavy rail for rapid medium d

There will be a combination. Autonomous cars replacing taxis and buses; light rail/MRT for the last 5 miles in dense city centres; heavy rail for rapid medium distance transit (100km < x < 400km); planes for long distance transit. If anyone thinks that there is the road capacity for a million self-driving cars to drop passengers during every morning rush hour in Mid/Downtown Manhattan or the City of London, they are deluded.