I bet that TC and the DOT will not allow steer-by-wire, for that is what this is in my lifetime. Same as I have seen no cars with brake-by-wire yet...tested and probably perfected by M-B but not for sale.
Argue that modern braking systems automate nearly everything away from the driver but there is still a hydraulic system that connects the drivers foot to the disc pads.
Argue that BMW's variable rate steering with the gearing and the motor is close to taking the control from the driver but there is still a solid mechanical connection
In both cases that solid connection may be damn difficult to use without power assist but it is there.
Interesting tho' having both the systems as fly-by-wire along with the existing throttle-by-wire would make the Google car control easier to implement, with fewer mechanical bits and pieces, and better...maybe even safer.
I think that allowing passenger aircraft to take off and land without pilot intervention is more likely.