None of those were asked to navigate and interact on roads with non-autonomous vehicles. That's the hard part I'm referring to. Simply staying in the lanes and taking the right turns is relative easy compared to figuring out what the people in the other vehicles are going to do. If you set the bar such that they never misread the situation then yeah, that's going to make the job effectively impossible. If you set the bar at "as good as an attentive but not very smart human" then I think we can make it in a reasonable timeframe.
FWIW I know of at least one company that's developing their autonomous vehicles with a remote piloting feature. In the event that the vehicle runs into a situation it cannot handle control is passed to human operators in cubicles that take over control of the vehicle on the spot and release control only after clearing the obstacle and the on-board autonomy gives the green light. They also had ambitions to record what the human operator did and program that into other vehicles into the fleet on the fly as they approach the obstacle. It sounded very ambitious (and data hungry) to me, but is probably the only way to fully remove the controls from the vehicle cabin in the foreseeable future.
FWIW I know of at least one company that's developing their autonomous vehicles with a remote piloting feature. In the event that the vehicle runs into a situation it cannot handle control is passed to human operators in cubicles that take over control of the vehicle on the spot and release control only after clearing the obstacle and the on-board autonomy gives the green light. They also had ambitions to record what the human operator did and program that into other vehicles into the fleet on the fly as they approach the obstacle. It sounded very ambitious (and data hungry) to me, but is probably the only way to fully remove the controls from the vehicle cabin in the foreseeable future.