Most people are remote. We'll need to get a better equipment setup with enough people in any one location. Cameras just don't have a wide enough field of view.
I was helping another company a while back that also used hangouts for the one or two people that were remote. The local people numbered around 20. They just needed to stand in front of the camera to talk.
If you go to a larger company all hands, there is someone talking with a mic and an audience. Then the camera would just need to be on the speaker in the front.