...not seeing the other person is a BENEFIT, don't you get it?
1) without video, it's easier to tell lies (to one's wife about where the person is; to a rejected applicant that "we will call you next week", etc etc etc);
2) in about 90% of all calls, people just don't feel like being seen. Take me for example -- on most of the incoming calls I take, I'm not groomed, shaved, dressed, or all of the above; most of the outgoing calls, I make while on the loo (need to use that time for something useful, you know).
If you ever read Karen Pryor's "Don't Shoot the Dog", that's one of the methods for discouragement: first, reward the behavior [that you consider undesirable], and then gradually stop giving the reward. The subject's thinking is, "Why the hell should I continue the behavior if I'm no longer getting the reward for it?"
I run an open wifi network, and I certainly do collect and store the packets poor chaps are sending through. I have a good excuse though, anybody who tries to connect is first of all redirected to a webpage with a huge warning: "THIS IS A PRIVATE NETWORK AND BY USING IT YOU AFFIRM THAT YOU UNDERSTAND THAT THE OWNER MAY COLLECT AND STORE ALL THE DATA YOU SEND". :-b