Removing the audio jack because its 50 years old is like removing the steering wheel on a car just because its 100 years old. Get over old technology, its the digital age. Drive your car with a joystick.There is absolutely no need to remove the headphone jack. Why?? It will make the iPhone thinner? So the camera can protrude more? Silly. Just shows in what direction Apple is heading.
But technology is slowly moving away from a need of a physical steering wheel. Automation is the future of cars and eventually will never need any manual driving done by the main passenger.
So your analogy doesn't exactly work. It's happening there, but just at a very slow pace and gradually. Instead of more an "overnight" thing like just cutting a jack out in a new model.