And if they were, the government would just make Google drive the car to an impound or something, probably, and they'd take that as well.
Google car expense is overplayed. In mass production and with competition the cost would go way down.
Also, if the government makes the 'homeless' drive to specific places out in the desert or something, that's better than the current situation where you're exposed to other homeless and dangerous people.
I actually wouldn't mind going 'homeless' for a while to save money on rent, but currently it's really dangerous to do so. Moving to low rent places is also usually more 'dangerous', especially with children. With a driverless car you can just take your family out into the desert or forest and pretend you're camping.
The current system of full-time rv-ing is quite hard because of parking restrictions and because sending kids off too school and getting groceries from out of town is hard, and because the rv's are too small. With self-driving rv's you can have a few of them to space out in.
But what if they're driving all of the homeless people out to the same spot in the desert? Cars, sure, are better than nothing but better still are cars the government can't use to expel or trap undesirables.
I'm sorry, but the idea of self-driving cars just creep me out.