I think we will see autonomous cars on our roads before this happens. Even so there will be humans watching and at the controls incase they need to take over. When lots of money is at play I doubt anyone would risk it on machines doing everything.

Time frame? 15-20 years many industries will be autonomous. But then where will the people work? No work no money no buy stuff. There is kind of a symbiotic relationship with consumers and manufacturers right now this automation may screw that up.