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To your first point (even if it wasn't directed at me) if the network of the console can sell it, I would be extremely confused, seriously GAMES sell consoles, that is what has sold every console ever...
In this age of multifunctional devices, I think it's more appropriate to say that experiences sell consoles, some of which are game-related. Sure, games sell hardware, but it's not just games anymore. A lot of people bought PS3 in its early days strictly for its Blu-ray playback functionality, the same with PS2 and DVD. In the same way network services do sell hardware to some people and households.
And while it technically may be correct that it was Wii Sports that sold the Wii, it wouldn't even be possible in its current form without Wii's motion control capabilities. Likewise, Dance Central wouldn't become as popular if it was just another dancemat game. That's what was the primary driver behind Wii's and Kinect's success, the new experience of interacting. Without it the Wii would probably be just a repeat of Nintendo's previous two generations - a profitable system with some great games, but a relatively meager market share.
My guess is this next generation is only a 5-year cycle for Nintendo and they release the successor to the Wii U sometime in 2017.
I don't think that's their aim, certainly not after their comments on how they failed with the Wii. They want Wii U to last as long as possible.