There’s a EU push to have GPS in every car sold by 2020.
It wouldn't surprise me to see a similar thing happen here, possibly as part of this camera requirement. If you're going to have a rear-view camera, you really need the Nav system with a sufficiently large view screen. My wife's car has the camera but not factory nav, so the camera display is a tiny screen hidden in the rear-view mirror (too small to be useful).
Overall, I prefer the obstacle sensor systems to cameras.