Videoconferencing is, has always been, and will always be a solution in search of a problem. Nobody (who has any sense) has ever said "gee, I wish I could look at a grainy, postage-stamp-sized picture of the person I'm talking on the phone with". Nobody *cares*. Not for meetings, not for classes. Audio is critically important. Shared presentation is critically important. Shared whiteboard is criticall important for some purposes. Video? Video is utterly useless.
(I've worked with most of the videoconferencing technologies out there, in the context of a large University research group. I've even built custom videoconferencing platforms for clinical case conferencing. It's all useless. People *say* they want it. People *think* they want it. But even when you spend $50k on a pair of high definition Access Grid Node rooms, it's no better than a good speakerphone. And nowhere near as good as $150 plane ticket.)