OP has a fair point. At the end of the day casuals may still get Kinect, and it can still be a bigger hit IF they can release some worthwhile games.
Motion control fads just aren't exciting the way they were 5 years ago. Nintendo actually saw it and basically stopped making much use of the Wiimote.
XB1 has pushed media functionality, but that is no longer a selling factor IMO. It's a feature that's nice to have, but not a device seller. There is SO much competition now for devices that play media and have voice recognition.
People now have multiple devices that do this under their TV. I can play media services on my TV itself (which also has voice and motion input by the way), on my cable box, on my BD player, Chromecast, etc. as well as my consoles.
When we compare to consoles, people are buying insane numbers of smartphones (almost 100 million smartphones per month), which can do speech recognition beyond what XB1 does, and you can control your TV and stream media to a $30 Chromecast from Android & iOS devices... (and you can multitask apps & web browsers too without XB1 snap 
).
Sadly I think XB1's primary features are in a crowded market, and a bit dated really.
