I like the idea of the private chats being able to have more than 2 people in them, but the other chats as Adrana has said will cause huge lag, also I wouldnt like to be on a conquest (as pilot) and have floods of chats going on as you have enough to contend without looking and reading maybe 8 chat boxes at once.
Some of the clans and alliance groups use voice comms which is a great idea and frees up the game screen so you can play conquests and hear whats going on, it shows on conquest that great voice comms leads to more organisation and better support for when your mothership gets into trouble