No, i understand the request. I think you guys are misinterpreting the ramifications. For Johnny streamer who's got a bunch of real players in a dedicated room with solid connections and hunger for real matches, it makes tremendous sense to have one guy dedicated to watching so that all of youtube can join the party.I think you misunderstand -- it's not a huge change that needs to be made. It doesn't affect performance at all. The actual stream does the work of distributing the game footage to hundreds or thousands of viewers; all the game needs to do is allow someone in KotH to spectate the matches without being queued up to play. It's an entire separate issue from network performance and really has nothing to do with the other things you mentioned.
The problem is, for everyone one of those, there will be a hundred random rooms full of random players with random connections that get blown up some wifi only nobody who wants to go into spectator mode while he spanks it to the torrents that just finished downloading.
For a game like Tag 2 even SF4, that have tremendous connectivity under the worst conditions, this is a brilliant concept, but Injustice's netcode is just not good enough to warrant the extra stress of a single (or multiple) dedicated spectators. Not if we're going to have to play bullet hell against Deathstroke, GL and Superman every other match.