I wouldn't get stuck on the lack of audio part. It can't be too far behind.
To be blunt, for a video-broadcasting site, frickin' AUDIO isn't a "fringe" feature.
I'm not disagreeing with you that audio is necessary and if it's part of the development plan, it should have been a major priority and I probably wouldn't have launched without it.
With that said, it's an assumption on our part that audio is necessary, even for for short 30-sec videos and they are putting that assumption to the test. Without audio, I don't think it'll work... but who knows. Until you test, you can't tell for sure.