Sub Anniversary Emotes for Partners and Affiliates
Having extra emote slots unlock based on your Sub Badge would incentivise maintaining a subscription for long periods of time, and will increase the amount of people who maintain a subscription to a channel. This would work in a similar way to Bit badge emote rewards.
It has been tough to get a ton of emote spots without going over 500 + Subscribers at one time. I think that each year a streamer has been streaming on Twitch they should receive a special emote slot available. It would show support from Twitch and allow for more emotes to be available the longer they stay on Twitch.