Companies want them so they eventually can kick out the people driving them.
But imagine being able to work or watch your favorite soap while in heavy traffic if you are commuting or going somewhere else.
When the technology matures it is not unlikely that it will be more safer than how people drive today. Combined with no requirement for rest. Imagine you are going somewhere which normally needs a 24 hour drive, when you are tired and usually would go to a motel, now you could just put your seat back and sleep while the car does the rest.
Or think about all who text and drive, drink and drive.