The final video [1] has a pretty compelling argument for the conversion to self-driving cars happening quicker than expected:
Chen shows a picture of Easter morning in NYC in 1900 and asks the viewer to play "Where is the car?". After several seconds he highlights the one car in the frame surrounded entirely by house-and-buggy carts.
He then shows a picture of the Easter morning in NYC in 1913 and asks the reverse question: "Where is the horse?", as there is only 1 horse visible in the picture.
Obviously this is a carefully selected anecdote, but this is a really compelling argument that forward progress will be faster than expected.