My answer was objective one instead of subjective view/opinion.
3G video calling is NOT an important part of 3G, at least in about 85% of the world.
AFAIK (Europe), nobody uses them, most phones/OSs don't even support that, and when they do they cost way more than a standard call.
Oh, and before anybody says anything: the same goes for MMS. MMS was just a "hack" before mobile e-mail became commonplace.