These doomsday predictions are constant for all large and powerful companies once they begin to exercise control. This has been said repeatedly of Microsoft, IBM, Apple and all other major tech brands.
However, it is unlikely one small disappointment (the iPhone 5 launch) will bring down the most popular and successful technology brand of our time. Sales popularity and profitability fluctuates with each new product release and it is very difficult to maintain a continuous upward trend in popularity. Just because the numbers weren't in line with previous levels of growth does not mean they are bad - it is very difficult to continue unabated exponential growth.
Authors always jump on minor issues or small sales decreases as if they fortell the failure of a company worth over $700 billion. Fluctuations are inevitable but don't spell the end of a company.