It suddenly struck me that I hadn't even tried the cameras yet in my iPad 2... So I did. And it's true, they are not great cameras. Barely useable for anything but video chat. (Adjoining pic is from the front camera, less than one megapixel.) Probably because of the thinness of the device, no space for a good lens or sensor.
But: I really like composing the pictures on such a large screen!
So I hope somebody will make a really good camera (say a lens and sensor in the class of the Fuji X100), and put for instance a seven-inch screen on it. It will be no pocket camera of course, but I think people will find that they pay a lot more attention to what's in the frame, and composing becomes a lot easier.
The user-interface on a 7-inch touch-screen could also be a LOT better than the interfaces we have on today's 3-inch screens on cameras.
And of course it must have focus by touch-screen, and shoot by touch-screen, like the new Panasonic Lumix cameras, that works really well.