If there is 10x to be made outside of Twitch I am pretty sure content creators will organize and create their own streaming platform. They know who is who, it takes some weeks to get everybody on board and then Twitch has a serious competitor. For that reason, payout won't get down.
Except that they'd have no idea how to get started and even if they did move, nobody else would follow, just like what just happened. Twitch is the Netflix of streaming. Doesn't matter who else does what, people will watch Twitch + <other_streaming_company>
