Apple is to slow to respond to market pressure. Last week the story was about a $3000 computer that only professionals can afford. Apple has lost touch with what the common person does with computers. And even if you put the answer right in front of their faces Apple will stick with the same format; profits first everything else later.
There is a business market for high end computers (Hint: it sold out and has a backlog within a short time) and there are other markets. They are not mutually exclusive. Technologies used there can also be reused in other segments later.
Their formula for entry level mobile computers are iPad and MacBook Air. We will probably see more innovation in those 2 categories. iPad is still leading the pack as we speak.
There will be new form factors every year, but it doesn't mean all of them will sustain their momentum.
Besides, this chart is for commercial channel (sales), it should not include Apple's direct sales numbers. In enterprise transactions, orders larger than hundreds are handled by Apple directly. So those selected NPD numbers are but a subset of the real picture for Apple.
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