The iPad mini, however, is more difficult to judge. Apple hasn't released sales numbers that don't lump the mini in with other models, suggesting it's been a failure and they're afraid to reveal how few have actually sold[2]. A failure by Apple's standards might be a runaway success by most other's standards, but the mini clearly isn't flying off the shelves the way an Apple device in a new form-factor should. It's specs were disappointing and it offered questionable value, so this isn't a huge surprise. I would bet good money that the next gen mini will treat the form-factor properly instead of giving it sloppy seconds, but consumers may have negative associations with the iPad mini brand that need to be overcome.
Personally, I think Apple really underestimated the appeal of the 7" tablet. A bigger screen is certainly nicer for some things, but 7" is perfect for reading ebooks and the smaller size of 7" tablets make them truly portable and comfortable to use hand-held. I'd love to see good sales numbers to see if it really is 7" tablets that are boosting Android sales and dragging down Apple's sales. If so, this might be a situation where an under-served market allowed an agile opponent to bust into a market firmly held by a single dominant incumbent!
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[1]http://www.tomshardware.com/news/Google-Nexus-7-Tablet-Sales...