Labor is becoming more expensive, even in the developed world. Eventually, people will want to do more productive things that drive a taxi for a little bit of money.

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.