I don't know anything special, but I think you're wrong. Three reasons: convenience, cost, and safety. These are just too nice and compelling to let this tech

I don't know anything special, but I think you're wrong. Three reasons: convenience, cost, and safety. These are just too nice and compelling to let this technology drop. Driver handoff is an optional feature. Cars could just stop instead. New cars have to have autonomous braking now (or very soon). A timeout on handoff can just have the car slow down to stop (which will trigger cars behind it to stop too). That's a compelling reason to have the driver want to pay attention enough to take the wheel before apologizing to everyone behind them.