I am positive that having webcam/video/voice options built into the program will bring a large amount of interest from those who are currently using fantasy grounds -- and will bring them over here.
Going to have to disagree.
Most people using FG use it because it has an attractive interface and closely supports one (or more) of the game systems they use (without needing to know any programming themselves.) Their own forums have threads like this where people ask for a VC option built in and they are always shot down and pointed in the direction of many other existing options (Skype, Google Hangouts, Oovoo, etc.)
This has been debated many times, and back before there were half a dozen great free options it held some weight. But now I see no reason to waste development time trying to do something that others already do better than MT could ever hope to.