Apple's shown some willingness in the past to cannibalize their own sales (the iPod is a prime example), so my take is less pessimistic than yours. Though I als

Apple's shown some willingness in the past to cannibalize their own sales (the iPod is a prime example), so my take is less pessimistic than yours. Though I also really want such a device (at least in theory), I think it's likely there are a lot of technical hurdles and trade-offs Apple finds unacceptable.