So you are saying you want to take the stream, recode/transcode it, and redistribute it on a CDN level so all viewers all around the world maintain a high quality connection? (I don’t see any feasible way for a player to be able to adjust bitrate/quality without doing this)
I do believe Twitch would have a slight problem with it, they would lose the ability to track viewers, ad views, and other important information.
Twitch does provide quality options to non-partners who maintain a high enough viewer count. I’m not certain what the viewer ranges are to earn this privilege.
EDIT: See this,