Follows endpoints and EventSub subscription type are now available in open beta

For the most part these changes seem great and are totally reasonable. But my one concern is the eventsub change and I have a couple questions regarding it. I understand that there will be a 6 month “roll over” period where the old v1 event will still work, after this 6 month period will those existing subscriptions stop working? My concern is that it needs a new scope for the new subscription, this is easy enough for “new” accounts to a third party application, but for existing accounts that means we would have to reach out to every single user and ask them to re-authenticate if they want live-follow based systems to continue working.

I guess ultimately my question is, when that 6 month period is over, is there a way to allow the v1 existing subscriptions to continue working, or some other migration path. I know that even if I were to reach out to every user of my application, a good chunk of them wouldn’t end up re-authenticating with the new scope, either from not seeing the messaging or forgetting, and I would end up with a bunch of support messages asking why follow based events no longer work. I’m sure that would likely happen for many of the bigger third party applications as well at a much larger scale.