Did anyone at Microsoft even bother to look into why the EyeToy bombed?
If the mechanic is not built into the console's core design, it is, by definition, a peripheral. The only two peripherals that Nintendo made that were successful was the original NES Zapper, and the Rumble Pack. Everything else was either mildly successful, broke even, or failed outright. I see the Kinect going by the wayside first and fastest, with the PS Move hanging on a little longer, due to the "Me Too" factor from Sony Fanboys.
No one who wants the kind of games that the PS Move/Kinect will provide is going to spend $200-$300 for a console, $100-$150 for the peripheral, and then, finally buy the games. If they want Wii-style motion control games, they'll go buy a Wii. Also, the backlash from the 'hardcore' PS3 crowd so far has almost guaranteed that the PS Move is going to fracture the fanbase.