I have elderly parents with deteriorating driving skill. My #1 reason for holding an M III reservation is the hope that then self driving capabilities of AP on HW2 will help them to stay mobile. There is the question about the full self driving ability of the system when M III is available, but also the reticence of older folks to sit peacefully as a car drives itself. Necessity may force them to accept this, but I also wonder if there could be a hybrid mode where the car babysits the driver and overcomes the drivers slowing reaction time.