Multiple Chat Channels
Some streamers with huge numbers have no choice but to have chat in sub only mode. What if you had two chats, all-chat, and a sub only chat, and the streamer could decide which they wanted to look at, whilst the entire community could still communicate with one another.

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Undeference commented
They already did this… poorly. And no one used it so they eventually removed it. I'm not sure they're interested in re-trying a failed experiment.
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itzhayleyuk commented
Multiple chat channels would be cool. Especially for chats with bot commands. Being able to have a channel specifically for bot commands and another for the actual chat would be great.
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I have no idea commented
Some people use Sub only chat and it doesn't allow only followers to chat. I think there should be like 2 chats where one is for subs only and one is for both subs as well as followers.