What you're saying is that that's kind of going to be a dead end because you can't just keep improving that route and get to fully driverless at some point, and then a driver is going to say, "This feels safe," and climb into the back, and something ugly will happen.
Selon toi, c'est une impasse, parce que c'est impossible d'améliorer au point de devenir autonome. Un conducteur va penser que c'est sécurisant, monter à l'arrière, et un accident monstrueux va arriver.