Million dollar idea

I've been listening to lots of podcasts and some of them are from conferences. The audio quality is often less than perfect especially when it comes to the question and answer period. Often people have to run around with microphones in order to record the person's question.
My idea is to have a small parabolic microphone with a laser pointer attached. When someone asks a question one of the presenters at the front points the laser at the persons chest who's asking the question and it should pick up what they are saying.
A more sophisticated version of this would be to have a system that points itself to the loudest speaker in the room. It would probably do it by having two or more microphones and will use the difference in time to calculate the position of the speaker. Then a pair of motors rotates the parabolic microphone to that position.

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