Agree 1000%. Aside from the extra time playing a video takes (far slower than reading), I wouldn't be suprised if more than half of web users, at any time, are unable to listen to audio.
At work, or on cell phone, it's not like a majority of people have headphones plugged in.
Do the numbers show that videos are so much more effective for engagement and conversion, that it trumps all the people who are unable to watch them?