The implementation died but the idea is everywhere. Skype, FaceTime, Hangout, etc. I have a daily video call on Hangout and last night had a speaker for a meetup talk over Skype. We're using "videophones" all the time.
Maybe they died, if we're talking about fixed station video phones that tried to emulate what George Jetson had. Those were DOA for decades.
Or maybe technology (better bandwidth, front facing cameras in laptops & mobile devices) just caught up with our realization that the concept is more useful when one or both parties are not at their desks or at home.