Aging drivers will have a choice re. autonomy:  get comfortable fast or move to where services/transit are available.  At some point everyone is forced to give up driving.  At least autonomous vehicles will allow people to stay at home longer.  

As to, “If you think about it, a driverless vehicle that’s coming and picking up the person and taking them where they need – that assistance is no longer there.”  What assistance?  I've never seen a cab driver port groceries, or their passengers to a vehicle, and if they did it would certainly come with an expectation.