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There are too many cars polluting the skies and requiring vast quantities of landscape to be paved for roads and parking. Also of note, driverless cars won't just impact US automakers, they will impact all automakers. There will likely be a short lived (in the 10ish year time span) boost in sales as everyone gets theirs, then people will just relax and enjoy. As an avid driver, I'm only worried (and even then, just slightly) that driverful cars will at some point be banned.

As a side note, I expect driverless cars to last longer than driverful cars due to the cars always driving smoothly and the potential for the car to drive itself to the mechanic for maintenance.