From the graph it looks like Tablets will be consuming demand for desktop computers. Really? If someone asked me and I hadn't seen any recent data I would have

From the graph it looks like Tablets will be consuming demand for desktop computers. Really? If someone asked me and I hadn't seen any recent data I would have suspected that sales would have been drawn out of notebook and netbook numbers as well. How many of these sales will be first time buyers? How many of these sales will be cannibalizing other sales?