I think it would be a bad idea.

Have you ever played a game with voice chat inside the game?

Example 1 vindictus so laggy when you use the voice then you had playstation home they had to remove the voice cause it was lagging everyone out. Especially since everyone complains about lag a lot here I can just imagine how bad it would be with voice chat added.

I don't see why people can't use other forms of voice or make a forum topic with all the voice chat options people can use.