Very interesting article. There's an error in this paragraph though:
"Using the latest sales projections from Gartner on tablets and current PC shipment estimates from IDC, we can see that by 2015 the tablet market will be 479 million units and the PC market will be only just ahead at 535 million units."
The Gartner figures in the linked article are badly formatted, but the correct tablet sales projection for 2015 is 326 million, not 479. Even so, that's not far off current PC sales, so still represents staggering growth.
(Also, since one set of projections is for sales and the other for shipments, comparing like for like would likely bring the two numbers a little closer again.)
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