He's comparing riding in a fully autonomous self-driving car that will let him and his family sleep at night when he's driving to flying. He's not planning on driving his car 40 hours over 4 days himself, I think the number of people that consider that to be a viable option over flying are very low indeed. I can almost agree with him that a self-driving car would make this viable, but I think he's overestimating how comfortable 4 nights of sleeping in the car on the road will be for him and his children.

When that fully autonomous self-driving car exists, then cheap self-driving cars for car-share will exist.