I need a poor-quality, low-sensitivity camera attached to the back of a foot-long iPad about as much as I need cameras built into my jeans, belt buckle, toothbrush, and turkey baster.
Just because you can build a camera (or two cameras) into everything doesn't mean you should. Cameras are a certain size and shape for a reason.
I see no reason to build a rear-facing cam into the iPad. Ever tried to hold a slippery, 7.5" x 9.5", 1.6 pound slab at arm's length before, and hold it steady? Not compelling.
Cameras aren't cameras anymore, they're just another sensor input. Do you want to scan a barcode or QR code? Do you want to scan a document? And then translate it? Do you want Augmented Reality games that let you fly a little spaceship around the room and shoot your friends? The plunging cost of camera chips means they'll be increasingly ubiquitous. I wouldn't rule out one on your toothbrush.
Just because you can build a camera (or two cameras) into everything doesn't mean you should. Cameras are a certain size and shape for a reason.
I see no reason to build a rear-facing cam into the iPad. Ever tried to hold a slippery, 7.5" x 9.5", 1.6 pound slab at arm's length before, and hold it steady? Not compelling.