Millions of users = billions in valuation?

So let me get this straight. Our youth already spend too much time playing video games. When they are not playing video games they can watch others play via Twitch. When are these kids going to read a book or actually talk to someone face to face?

http://m.sfgate.com/news/article/Amazon-bets-that-S-F-s-Twitch-will-be-next-ESPN-5714508.php