Even if that were true, it's still not a market I can see Apple penetrating.
First of all, there's not a lot missing from the camera market as it is now that Apple can take advantage of. For the most part, camera manufacturers have taken cameras to amazing levels, and there just isn't much room for improvement (other than the technology itself).
...You say the UI, but is the UI on a camera really that important? ...I'd say that many digital camera owners never even use it (and the rest don't care).
Plus, if Apple were to make a digital camera, they'd have to outsource practically every single component. ...It'd be practically like the HP iPod, only in this case it'd be the Apple Cybershot (a sony camera with Apple's UI). ...Do we all remember how that HP iPod worked out?
And Apple would still be missing the most important thing: reputation. People care a lot about their cameras. They want a camera they can trust to capture their memories forever. Everyone's worst fear is getting back from a vacation to find out all of their pictures are blurry. ...The same isn't true for an iPod or iPhone because if it doesn't work well, you buy a new one and you've only lost money. If you buy a camera that takes poor pictures, you've wasted your money and lost your pictures forever.
How many people are willing to take a chance with their memories?
PS - Plus, an Apple camera would have virtually no professional support (they'll stick with their Canons and Nikons and Sonys). Who's going to want a camera that the professionals don't trust?
not dslrs, point and shoot, and comon, 2 years ago you wouldnt see apple making a phone, so you wouldnt see them making a camera