Also, an accelerometer barely qualifies for (and i would argue, doesn't qualify) as motion controls, and instead is just a bidirectional analog input, there is no external tracking (lightbar / kinect / eyetoy-or-pseye) tracking positioning, so the accelerometer input can be used with nothing but gravitational shift (try playing a mobile game that uses accelerometer in a car while its turning).
Body movement tracking (true motion control) was a fad, Sony got there as the Wii trend was tapering off, and sold poorly, Microsoft got there with Kinect around the same time, and sold decently, but only because Microsoft broke out the credit card and advertised / pushed so hard to force a moderate success.
Accurate motion control was a fad
Cheap motion control (mobile) was a fad







