Twitch.tv is more important for anyone who follows E-Sports than any other property out there, Cable or Net.
I'm on Twitch.tv more than ABC, NBC, CBS, etc for 8 months out of the year (football season excepted).
And I'm definitely not the only person who is like this.
No kids are leaving Twitch as long as it doesn't get rebranded. Amazon just needs to run it as a separate product.