My wife pulled off a major 5 hour webinar with many speakers (maybe 25) web cams etc etc with no issues with the tool. This was a big event with her organization. Wasn't much time for planning logistics which I never suggest but it went very well. Even though the tool only does 6 web cams you can still switch em in and out throughout the large group of faculty.
This was followed by a few separate sessions that attendees signed up for following the larger group event.
Very cool
Congrats to your wife. Having done some large GoTo events, I know it can be a lot of work keeping it all going.
You can expect a 25 webcam capacity soon with GoToWebinar broadcasts.
Congrats. We'd love to hear more details and any hints or lessons learned you care to share.