Here is why this is great. As the industrial revolution was just starting up, many places in Europe banned this or that new labor saving invention - to preserve jobs. But not all, many others allowed the new machinery, this quickly forced all other to either also allow it or fall behind economically.
Back to Nevada, Google will now start moving cars there. I can't be the only who wants to sleep during the commute to work, people in Nevada will start doing that. At least some old people will use this, and then more and more as they see how great it works and grants them greater independence. Parents could start using it for their teenagers. It will save lives. How long before someone in Nevada starts an all driver-less taxi service?
This marks the beginning of an honest to goodness technological revolution, how often do you see that happening in one lifetime? And it's staring in Nevada.