It won't negatively impact* Microsoft's 360 division unless they lose money on the device once launched, which, given R&D is already written off and each camera should be sold at a profit (I believe), is just about impossible.
If they do start losing money on Xbox again (a big if at this point, at least until they decide to launch a new console - which I believe will be sold at a profit from the getgo for this very reason), then they could have problems. It's actually quite interesting to look at how the division has changed over the past few years, and what corporate strategies are probably at play here.
It seems the 360 division no longer has a blank check with which to run its business. The idea of a video game console dominating the living room as the ultimate convergence device - the golden goose Microsoft decided to challenge Sony for ten years ago - turned out to be nothing more than a blip on the radar before handheld convergence devices took over. iOS/Android are where it's at, and it won't be long before hardware running such software can plug right into your TV and play movies, show web pages, etc. Hell, even TVs are becoming equally as capable as consoles in multimedia functionality, with services like Google.TV bringing web browsing and the like straight to your television.
The initial vision for Xbox is no longer and/or was never attainable, and as such Microsoft are now focusing their resources on platforms like Windows 7 Mobile. The Xbox division will have to maintain itself from here on out, which is why the division has been prioritizing profitability over marketshare since the 360's last price cut. In a way, they're like Nintendo now, and it'll be interesting to see how they handle Kinect and the next Xbox given the way things have changed.
It kinda sucks for Microsoft. They had an excellent idea of where the market was heading back in 2000, but they tackled it in the wrong way. Had they invested into Windows Mobile even a fraction of what they invested into Xbox earlier in the decade, they could've grabbed iPhone/iPad market before Apple even showed up.
*Aside from the long term ramifications of diverting first party resources away from their current market and towards Kinect.