[vinylengraver]

See, I do not think it is possible for ALL vehicles to be fully autonomous, ever.
Just like there is no such thing as gun-free society.
Armed forces and law enforcement will always have access to human-powered means of transportation. And it will run on internal combustion. If anything, in the unlikely event it all turns to shit and power goes down.

And if they have them, others will want them too.

Besides, they surely must have watched Terminator and do not want a real Skynet disaster to happen, right?
Anyway, I will make sure my grandchildren know how to operate a manual transmission, gas powered car... there will be one sitting under a tarp in old man's garage. Just in case.
And a motorcycle - way better to negotiate curbs, sidewalks and all other narrow passages.