The problem would be that computers cannot possibly take into account every eventuality, and some human control would always be required, in my opinion. With the keeping in lane control, for example, what would happen, say, in thick fog, if you suddenly had to change lanes to avoid a collision? If the car is fighting against the driver, that might put him at quite a disadvantage. I'm sure there would be fail safe mechanisms built in, but I'd find it pretty scary to have no control over the vehicle myself.