But, if video chat was integrated into our phones (and particularly if it wasn't restricted to wifi only like FaceTime), then video chat would be as easy and frictionless as voice calls. I think I'd probably use it a lot under those conditions.
I wouldn't make a video call while walking around, but I'd much rather make a FaceTime call than use skype on my laptop, especially if its with a loved one.
see also: http://techcrunch.com/2010/07/10/apple-facetime-commercial/
My guess is that the portability of the front camera on the phone means that you can not only show yourself, but also point to things around you at ease. This isn't something that can be done easily with a computer (or even a laptop for that matter).