Also the article touches briefly on drivers going into jobless. A lot of drivers where i'm from seems to be retiring middle-old age working in taxi. I think it's a good job fit for them and I don't know how the new self-driving industry can provide the same thing (?)
The economic benefit is significant to companies building self-driving cars, good enough to pursue if the tech is within reach. But to your point it's indeed much less of an improvement compared to various historical automation technologies that create >10x incremental efficiency gains.
There is an argument for traffic optimization that will be possible when self driving taxis are common, but this is more of an argument also for the developing world where traffic is a much larger problem than the developed world (e.g. LA traffic is nothing compared to Beijing traffic).
I just look forward to a lifestyle in the states compared to the one I had back when I was living in China.