Au contraire, most of Apple's profit these days come from mobile sales, ie, iPhones, Touches & iPads.
The Touch market may be approaching saturation (although even that is debatable), but smart phones are a relatively new market, and the market for iPads is less than a year old.
Plenty of room for growth in both, including App sales, music, TV, movie, book downloads, advertising, etc.
For that matter, Apple still has plenty of room in which to grow old-fashioned computer sales.
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