The one technology that I think could kill the iPhone (AAPL)

Apple is truly the iPhone company right now. But that could change soon. The iPhone business accounts for a whopping 68% of Apple's total revenue, which should frighten Apple just a little bit. If something happens to the iPhone — rival phones get better, or a better mobile technology comes around — it could jeopardize the biggest source of Apple's income. That's why Apple is investing in so many different cutting-edge technologies right now. Apple needs a hit, and it needs one soon. Thank...