The more I think about it, the more I like this idea. With the right piece of equipment, the microphone could be used as a "remote microphone" like he did, or even as a desk microphone for other recordings.
This model will act as a USB microphone, or will record stand-alone. It even has both front and back recording capabilities, so it could be used to record face-to-face interviews. It also roughly the same price as a wireless stereo lapel microphone.
Other than the need to always synch up the audio to the video (no big deal to me), does this sound like a flexible setup?