One look at this slide shows Apple has no idea exactly where its demographic lies:
Apple just told the world it has no idea who the Mac is for
Owen Williams
6K488

I see this as a transitionary period. They are clearly trying to streamline the lineup, but Tim is a business guy. Its a sensible move to offer the 13" Air whilst also offering its replacement, it allows them to meet the price points they want but also means people get the opportunity to buy from Apple.

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