system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What if Luke Skywalker would have turned to the dark side when Vader revealed himself as Luke's father?

Vader says that they can end the war, overthrow emperor Palpatine, and rule the galaxy as father and son. Would this have happened? Or would there have been a different outcome?
gpt
Luke was incredibly strong in the Force, as was Vader to a more limited extent. With some secret training a la Starkiller, it's feasible that they could have united and overthrown the Emperor (breaking the Rule of Two), though Vader might die in the process due to his vulnerability to Sidious' lightning. Then, the Rebellion is almost entirely doomed - but they still have Leia. Within a few years, she could be ready to confront her brother (and possibly her father).