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If we mis-apply Moore's Law which can be stated in two ways
1) the number of transistors on a chip doubles every 18-24 months, for the same cost
2) the cost of a given number of transistors on a chip halves every 18-24 months
then:
mid 2008: 6" screen, $300 or £180 or €215
late 2009: 6" screen, $150 or £90 or €108
mid 2011: 6" screen, $75 or £45 or €54
at this stage a Kindle/Sony type device costs about the same as two hard back books. This is the sort of price point that I think parents would be happy to buy their kids 1 device every year or so dependent on wear and tear/theft etc.
If users decide that a larger screen is their preferred size then if follows that the tipping point arrives at some later point in time.
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