Sakkura :
The Oculus Rift IS something new. It's the first head-mounted VR device that works properly and is affordable. You cannot compare it to the ones from the 90s; it's like comparing an iPad or Android tablet to the crappy tablets they had back then.
The kinect, on the other hand, is old news. The Xbox 360 had it, and all it did was give people another reason to laugh at Microsoft.
As for a mobile kinect, that's not possible. The Xbone is not portable, so the kinect will not be mobile either. Simple.
Ok, I'll bite.
First, those 90's VR helmets worked just fine. Actually, quite the ride, and MechWarrior 2 was *awesome* in one of those 90's headsets. The price is the only point you've got here, because this is not new commercial technology at all. Making an existing technology cheaper does not make it a new technology.
Mobile Kinect is not possible... Hrm. You did notice that I used the term "Kinect type devices," right? Now, aside from the fact that MS actually has a patent for a micro-Kinect that hangs around your neck and outputs a projected display onto a surface that you can interact with, you do realize there is a laptop out there that actually uses a version of this technology for control at this very moment, right? Heck, Tom's even reported on it.
http://www.tomshardware.com/news/hp-envy-leap-motion-laptop,24309.html
This is just an early step in making motion control portable, but it's quite telling about your deep insights on this subject that you say that this is "impossible" when it's already out.
Lastly, concerning your overwhelming insight, you do realize that the applications I was suggesting went far, far beyond the XBOX and gaming, right? Do yourself a favour and google "novel applications of Kinect" and you'll find dozens of articles ranging from artists, medical facilities, sports training facilities, and even the military putting it to use in strange ways. But heck, this isn't even what I'm thinking of - I'm thinking of the potential that is staring us right in the face, in our living room. Take a page out of Star Trek's book and walk into your room, say "computer, Mozart's The Magic Flute, act two, play." Or sit in your chair and control your computer by waving your finger. Or heck, why stop at computers - with more and more devices becoming "smart," this type of technology has applications to everything from automobiles to toaster ovens.
Now, my serious question for you at the end... If you think the Oculus Rift is going to be some massive game changer beyond a niche in gaming and media, could you explain to me how this technology - which was commercially available about 15 years ago already - is going to be used in many walks of life? As in, your office, your kitchen, your car, your living room, family gatherings, parties, you name it? Because I can give you pretty easy answers for each for Kinect, but all I can see for the VR helmets is relatively isolated settings.
Again, don't get me wrong, I think Oculus Rift is very neat and I'd like to have one for what it's good for, but... The idea that it has the potential to be the game changer that Kinect type devices are is just ludicrous.