The desktop equivalent, CU-SeeMe, was working in 1994.
Not to mention it needed installation (Javascript just needs people to go to a specific page), and the speed, lag and buffering was horrible at the time.
That has nothing to do with the software and everything to do with the network, no?
Even on the same network, different conference apps have different characteristics. It depends on the compression and coded they use, how they handle changes in network performance, etc.
Plus the GUI and UX of that app was simply horrible.
http://en.wikipedia.org/wiki/File:CUcollaboration.gif
http://www.teknoblog.com/wp-content/uploads/2012/07/gmail-go...