Nah, I don't need a Kinect. The only thing I would miss from not having one is screaming "Xbox record that!" when a game has a freakout and glitches out.
I'm really hoping stuff like that can be added to voice support via headset or something. I'd hate for people to miss out on what I consider a core part of having an Xbox One, being able to yell at it.
The PS4 voice stuff works surprisingly well with a mic, even with my atrocious english.