EQ2 has a pretty decent in game voice comms option, WoW tried it but folk rightly went eurrgh and stuck with vent.
Would be good for pugs of all sorts and an option that is either turned on or off at your choosing like swear filter, but if the quality was decent and there is no reason why it shouldn't be in this day and age ...maybe pugs in pvp could start getting their act together.

Might open things up a bit.