Wouldn't that just make them a bit happy that it will happen, and give them less incentive to stick around knowing justice is coming rather than wanting to stick around for the possibility?
Nah, I'd want to watch it unfold like.
If I was suicidal and desperately loved Harry Potter back before the last book came out, I'd want to wait for the seventh and last book to come out before ending it. If JK Rowling told me how everything would end, and I already was at the edge, why would I wait now happily knowing how things end in the one thing I wanted to know before dying?