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I think people are underestimating how much of a barrier usability is w.r.t. making video calls. The reason people like voice calls is because it gets the job done quickly. I am not sure how Apple has implemented video calls. But imagine if their implementation is as follows: 1) You call somebody via a voice call 2) The call goes through and you start talking 3) The apple clients on both devices detect that they are connected to WiFi and they start setting up a video call connection in the background while you are still chatting 4) In about 10s after the conversation started, you start getting a video feed.

Wouldn't that be awesome? Wouldn't you use this free feature if it came at no cost? I know I'd LOVE it.

Other than the points highlighted above (and cost of video call), the big question is how are video calls done in Asia. Does it require the user to spend more than 3-4 secs to set up a video call (check if the other person has video call support, is he on the same network, do some prior WiFi settings, etc.). If so then that is a big barrier. And Apple definitely has the usability smarts to break that down.