Well consider this as well, earlier this year we had rumor of up to 5 nexus devices, it doesn't make a whole lot of sense for a bunch of OEMS to put out a few phones and tablets against each other with little to no differentiation. In that situation we hit a snag where there's at least one red headed step child in the bunch, a nexus device that just sells relatively poorly and in all likelihood receives far less support from the dev community. On the other hand we could have 5 very different nexus devices a nexus phone, a nexus 7 and 10, nexus q (hopefully with gtv support and other bells and whistles) and a nexus book to round out the 5 devices. Then you have 5 happy OEMS all getting early peaks at the latest greatest android and not having to worry about their nexus competing with another nexus as they'd all cover very different market niches.
This is just what would make sense to me and I'd like to think googles brain trust has at least as much forethought as a guy watching the mobile industry from the outside.
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