Anytime after the 10 year mark for anything animated is nothing but Purgatory. Once you accept that this work will never continue again is when you can move on.
Haruhi fans are a special case, since they're stuck in an eternal purgatory cobsidering the source material will never be completed and the franchise's collaborators keep cock-teasing them with cruel announcements like Pachinko (which also symbolizes the death of a franchise).
Remember back in the early 2000s when Evangelion was nothing but merch and pachinko games? There's still hope, I guess. Not much, but still, some at least.
No, there will always be a chance. As long as there is faith in the heart of just one person, then S3 is sure to happen one day.