AC has nailed it on the head - most people who want an iPad already have one.
Last time I saw some figures, iPads accounted for the majority of UK tablets (though that might have changed since the cheaper Android tablets have become more cheerful), and of those iPads, the majority rarely leave their owner's home (so battery and weight-saving improvements aren't as crucial as they might be for phones). As a device to quickly conduct a web search or view some images, an older iPad looses little to its newer siblings.
AC can see the bleedingly obvious, whereas Wired.com is talking bollocks as usual:
"Nobody Knows What an iPad Is Good for Anymore"