It would be sad. If there are never notes or anything to let anyone know what the end could have been like, it would be a great loss, a mystery, and I would torture myself wondering how it would have ended.

So I'll just hope this won't happen. Seriously, it would be bad, and I don't think anything would make it better, be it someone else taking the story (but without notes to go from) or fans providing various interpretation of what they think the ending should be...