4. Replace The Jedi Temple With A Sith Temple
Duh. Is there really anymore that needs to be said about that? Why you would take the time to plot for years to destroy the greatest peace-keeping Force (pun intended) in the galaxy, the Jedi, and not replace them with something just as equally powerful? Can you imagine how much scarier the Empire would have been if it had had more than one Darth Vader? Think about it - an entire army of Sith Lords at the Emperor's disposal. Luke wouldn't have stood a chance! In this case, it would have been better for him if he had stayed behind to perish on Uncle Owen's moisture farm. It just makes no sense that Darth Sidious never thought about it. Maybe I should have been in charge of the Empire.