Time travel is not a bad story idea in and of itself, and Trek has done it well in the past. It's just they ran the idea into the ground, and without clear rules and limits, it diminishes the impact of everything else.
For example, if you make Time Travel too easy to do (like just slingshotting around the Sun, consulting the Orb of Time, or the Borg doing [insert Technobabble] to create a time portal that the Enterprise can duplicate at the end of the movie), then when you're trying to build up the next crisis of galactic survival, the question will be well why not just use time travel to fix it? For example, for the episode where Voyager is transported to 1990s Earth, I kept waiting for a technobabble explanation for why they couldn't just do the slingshot around the sun time travel trick from Voyage Home to get back to 24th century Earth?
Also, Trek has never been consistent about time travel. Does time travel cause the original timeline to change or cease to exist?
For example, if you make Time Travel too easy to do (like just slingshotting around the Sun, consulting the Orb of Time, or the Borg doing [insert Technobabble] to create a time portal that the Enterprise can duplicate at the end of the movie), then when you're trying to build up the next crisis of galactic survival, the question will be well why not just use time travel to fix it? For example, for the episode where Voyager is transported to 1990s Earth, I kept waiting for a technobabble explanation for why they couldn't just do the slingshot around the sun time travel trick from Voyage Home to get back to 24th century Earth?
Also, Trek has never been consistent about time travel. Does time travel cause the original timeline to change or cease to exist?
- Yes, it does, if you believe TNG's "Yesterday's Enterprise," Star Trek: First Contact, DS9's "Past Tense," or TOS's "City on the Edge of Forever."
- No, it doesn't, if you believe Star Trek (2009), which before anyone starts screaming "well, that's the Kelvin Universe," Spock from the Prime Universe continues to exist and Star Trek: Discovery confirms that the time travel which caused the Kelvin Universe only created a separate parallel universe that sits alongside with the Prime Universe.