I believe that not all shows need to end, it depends of the type of story and characters.

AHS’s fromat as an anthology to me, means that as long as new creative people can keep telling new stories that are in-line with the original theme of the show, go for it.

Those who have been watching a long since the start know not to have any high expectations for good conclusional storytelling, so long as they keep trying with original ideas I’ll keep giving the show a chance.

If it was a show that was based on a singular dramatic story, that however is better told with a conclusion in mind.