This is something that I don't see Apple ever doing on their own. I don't think you'll ever see a blue shirt sporting genius with weird looking camera headgear trekking around the Grand Canyon.
But, maybe they'll buy a company who would? What do you guys think?
P.S. I'm not an Apple hater at all, writing this with a Macbook Air, Cinema Display, iPhone 5, and an iPad on my desk. But I do feel like as far as this much dedication to their mapping service, it's not going to happen.