Not for much longer now the cat is out of the bag.
Twitch is not a replacement for Justin.tv. Justin.tv not financially viable. Game streaming is, hence twitch.tv
From Twitch Rules: "Non-gaming, non-music content: Video games, board games, card games, fantasy sports, LARP games, and acceptable music content (see above). And while it's nice to take a break and just chill out with your audience, please ensure that your channel's primary focus is on gaming or music creation."