There are different levels to maintaining. I would definitely try to support it to the max for an overlapping window with the new version (like a year?) and in a much lower-level mode after that. I don’t think software should break all that much once it was that battle-tested, but sure enough it can happen. After a time I would probably only care about personal emails notifying me of a bug, and if it is a quick-enough change, maybe will do it.
