"Would you like to resubscribe to this broadcaster with Twitch Prime?"
When watching the broadcaster you previously subscribed to with Twitch Prime and your subscription ends, trigger a resubscribe notification In the same way Twitch pops up the "Announce your resub anniversary" notification.
Have it suggest resubscribing with Twitch Prime once it's expired. If they click "share", it automatically resubscribes with their Prime subscription.

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FrancisOmega commented
I agree with Lisandro MRT, no sub should be forced
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PirateSoftware commented
Making my yearly visit to this "Planned" feature.
See you again in 2023 old friend. -
Nightcaaat commented
Really disappointing to still see this marked as planned
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twitch.tv/MonicaElleRose commented
this has been marked as planned for 5 years
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SleepingLunaDesigns commented
It's 2022 and it's still marked as planned...I'd personally like to see this happen, as I like to give my Prime sub to the same person every month.
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Cyborg_Jellyfish commented
Well then. I notice this was flagged as "PLANNED · Aug 1, 2017" and yet I still have to manually resub to a channel with my prime...
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LisandroMRT commented
sorry i dont want to be rude or anything, but whey it re subs to a streamer i never saw or folow.. shouldnt force to random sub to any twich that u arent folowing at least doesnt make sense.. i was gonna sub to ydcb or tyler or masta and this did go sub some one i never wear or isnt my type of streamer at all its a litle anoying!
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Char commented
Today twitch added a feature to notify you when your paid subscriptions expire, prime subs should be added to this already existing feature because they do not automatically renew.
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SilentSnaple commented
I like both of the ideas you guys have come up with!
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Sslix commented
An alternative feature to this would be the ability to toggle automatic resubscription, which would allow us to gain certain perks that Channels have set for 1,2,3,4,etc year subscribers
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Matthew Ward commented
This would be a nifty feature.