I just watched the recorded twitch stream of the Expo finals and I have some thoughts regarding how to get more people interested/watching, but not necessarily live and not necessarily with new technology... so this is only kind of on topic...
Anyways, I'm not sure why we're so focused on the LIVE aspect of these streams. I don't think we're ever going to get big audiences that set aside 4+ hours to watch a finals as it happens. In this day of on-demand viewing of everything, I'd argue that a much more concise and produced presentation of pinball would be far more entertaining and consumable by much bigger audiences.
One big suggestion along those lines is to stop making the video/audio recordings of the games an after thought. It's great that every single game (except for the one GoT machine on the FINAL match!!) now has video set up, but the glare from the sun made it impossible to see scores and parts of the playfield. I'd also love to be able to hear the actual sounds of the game being played behind the commentary. If you want people to watch, make sure that the location/video/audio recording is just as important as the format of the tournament itself.
Second, is to forget about live commentary. Or maybe do some live commentary for the small dedicated audience that will watch as it's happening, but I wish there were a team that was editing footage down, splicing different feeds together (while multiple matches are happening at the same time) and doing a more rehearsed commentary with prepared notes on games and a clearer story arc.
Then you can start talking about adding in technologies like slow-mo replays and telestration. But I don't think doing that kind of thing live is really an option at this point.
I think this also relates back to the larger discussion on how to get competitive pinball on TV and in front of larger audiences, and I'm guessing the reason we can't do this now is because we don't have the money/time/talent/audience/sponsorship to create highly produced shows like I'm suggesting for these tournaments.
Anyways, that's my dream.
And all that being said, I'll also add that I love watching the live feeds as they are now (but I'm one of the highly dedicated - nerdy - few) and am really grateful that they even exist and are as good as they are. I'm also grateful for all of the folks that put all of their time and energy into making them what they are now. So thank you!