Kinect Sensor and Voice Control

In my previous post I mentioned that I had set up Microsoft's SAPI to implement voice control of my lights. For the most part, it works well with the tweaks I did with the grammar file, except that you have to train your speech. For what I want to accomplish that will be a large issue. I want anyone to be able to walk into my house and use the system. It should be a hands free system that doesn't make turning the lights on more complicated with having to use something like your phone (but that too, can be an option). I have been playing with the idea of using RFID/NFC but it still would involve always having your phone around; also, not everyone has a NFC enabled phone. So hopefully speech recognition is the answer. I did some searching for a good microphone that was good for large areas like an array microphone or something. Many of the prices were out of my budget. Plus, I'd still have the training problem. Then I had a thought, I have an array microphone already in the living room: the Kinect!