Why will it be a habit, its not like a new console gets released every time a new game come out.
Making a habit of releasing unfinished games and letting companies release the rest of the content via "DLC". Microsoft has made companies rush to put games out before(the cut content just got bushes status). To the point they've had to cut whole campaigns and such(granted those games never popped off like that, but still, M$ has done it before).
They're pushing this for launch, but I remember one of their studios admitting they rushed a couple games out way back in the early 360 days trying to push cross-platform gaming between 360 and PC.