Call me crazy but Apple right now is a profit machine and owning the stock has been spectacular success, in my mind their success if largely dependent on the iPhone.
I wonder if some technology comes along and makes cell phones less useful will Apple suffer a huge disruption because their success so tied to one product.
Apple seems to be trying their hand at media content like Apple TV. I don't know how much money it makes or if it's got a future. They tried their hand at a server version of the Mac OS, but that didn't last long. So it looks to me like Apple's revenue is tied to the iPhone, iPad, and some sales of Mac laptops and desktops (especially in the video editing industry).