I dont think Face Time is for general calling. It's aimed at families. I spend ages on Skype Video with my parents and grandparents and they love seeing my kids. But video Skype is tied to my PC at home. My wife and I have iPhones. My parents would get them simply to see my kids anywhere, any time. I for one will probably upgrade both my and my wife's phone for this reason alone. Look at Apple's promo video for FaceTime and that's exactly where it's aimed. This is not about trying to migrate voice calls to video calls at all.
FaceTime? Try Rehashed Pea Salad