No, there is no requirement to support the software, at least according to what we've heard here. Simply that you can't remove your current rev from the store - you can't prevent people from downloading it.

That's a bit misleading. You can unpublish the app[0], which hides it in the Play Store and prevents new installs. It just doesn't remove the app from the people who already have the app installed, and I think they'll be able to install it on new phones.

I don't know why the OP is choosing not to unpublish the app.

[0] https://support.google.com/googleplay/android-developer/answ...

Unpublishing the app doesn’t remove you from having to comply with address requirement.

Yes, but it would mitigate the issue almost completely since the app (and thus the address) would not be discoverable by new users.