What if Anakin Skywalker had not turned to the darkside and became Darth Vader.

Would Palpitine destroy him for not joining him? "He will join us or die".

Would the Jedi order exile him for having a love affair after Padme had the twins?

Allthough it is highly unlikely, could he have been killed during order 66?

Would he abandon Padme and claim that he had no part in a love affair with her?

Would he continue on and be the chosen one, devoting his life to bringing balance to the force?

There would be a major shift change in the galaxy if this event had occured.
The event could help or hurt the galaxy, be careful what you wish for, and may the force be with you, allways.