Indeed.Betrayal? I think you're overselling your point, here. Nothing's stopping a show from doing a one-shot episode focusing on completely different characters. Like an episode focusing on technicians working obscure engineering stuff during a mission and having no clue about the actual mission, while we explore these nameless people.
Time travel is a crutch. It can be used well (rarely) but in my opinion Star Trek is best leaving it behind.I agree, especially since one of the most highly-regarded episodes ever in serious Sci-Fi circles is a time travel story. But when it becomes more a crutch and is done way too much, then it loses some of the novelty and excitement.
It won't but that's how I feel. No time travel story has really garnered my interest very much, save for maybe "The Voyage Home."