in their post explaining why they do not want to add it they did recommend using Skype (free on computer-computer calls) or ventrillo which does unfortunately have a server cost. I believe if they added in game voice chat it would probably end up like Fable onlineplay where 1/2 the time you are in a town you are hearing several random conversations, however if they only go for party or FC voice chat SE did mention that it would eat up a lot more bandwidth.