You make a very interesting and compelling series of points. I think, that instead of doing with GoPro's, the new Contour would be a better bet. Yes, it has a bit of a fisheye effect, but would give a smaller profile and allow more people to adopt the method.
As far as streaming to the internet goes, it would run into a large problem - which camera where, which player to follow, etc. This would require a VT guy for each event being streamed - 5 cameras per team, plus overall views, cameras on jibs, etc. (comes to about 13 or so cameras in total) - It could be done, with a lot of money and a comitted team behind it, and would make the game much more watchable. Then we run into the problem of "he's just shooting at a bunker, that's stupid" - I'll leave that to someone who knows more about speedball than I do.
So - not a bad idea at all. Where'd your tutorial/sample video go? I was looking forward to them
As far as YouTube streaming - I've done an HD stream before with no problems, but I think I might be a "YouTube Partner". Google Hangout is terrible, but I've heard that Vimeo might do a streaming option for its premimum members soon.