People have asked Brammo about using G+, but Brammo's answer has been the "only a limited number of people can participate." Either they weren't aware of the enhanced version, or there are some reasons, unknown to us, why they chose Livestream.
At least Livestream should be more able to handle the traffic than whatever Tesla used during its launch of the Model X. That was a disaster.
I was thinking more like having the hangout open on my laptop while watching the livestream on my desktop. Kind of like youtube's new "start a google + hangout" feature under the "share" menu.