I don't think that's what people mean. It'd be nice if the show ended there not with the doctor killing himself but with him regenerating only we never see the next one. Like if it had to end, end it in that open way. The story continues, we just don't see it.
People saying Doctor Who should have ended with Twice upon a time didn't understand the episode at all
This is an episode where the doctor confronts his past to decide what he wants to do with his future
Having it be the doctor giving up after such an hopeful ep would terrible