There are two types of integration:
1.- Streaming easily, on twitch.
2.- Advertising those streams.
The first type will never happen in QL, but the second one could very easily.
Someone that doesn't visit ESR can hardly know about quake streams. That stream side bar (right) is superb and other games feature stream on their client, as the main attraction right in the middle, even promoting individual streamers (lets say strenx).