They're saying they won't be ready for the general population until 2020-2030. The issue is even if the car is safe, other drivers aren't.
Any idea about the cost (I mean capital cost + annual maintenance) ? If the system costs much more per year than the cost of hiring a human driver, then I don't think that too many people might be interested in it. Also, any attempt like this one is likely to attract protests from the drivers union.
And yes.. right now it might be too early to ask about the operating expenses.