Consumers' shift to older iPhones raises concerns on Wall Street

In recent months, such an unusually large proportion of consumers are opting to buy older iPhone models that some analysts have begun to wonder whether Apple has lost its ability to create new versions that have enough dazzle to justify their high prices. Not only has the shift toward cheaper phones nibbled away at Apple's profit margins, it's been dramatic enough for some analysts to view the iPhone 5 as a disappointment.