It'll be interesting to see how this pans out - but I can't see it being widely adopted in the home any time soon. People who want gesture based stuff will use Kinect.
However, I can see this being huge in the commercial market. I can easily imagine using something like this in a shop, or for presentations at work.
Googling for "kinect price" gives me numbers of about $150; this is priced at $70. Even if we assume this is a discounted price to lure in pre-orders, that still leaves room for it to cost less.
I would not think of getting a Kinect but my thought upon seeing the video was "I want to get one of these and use it to control the RasPi I'm sticking in some fake taxidermy along with a pico projector for a micro media PC."
I think you're spot on. Every mall in the developed world could have easy to use 3D maps and offer/advert displays - that's a huge market right there, whether or not the desktop ends up being one.
However, I can see this being huge in the commercial market. I can easily imagine using something like this in a shop, or for presentations at work.