So i was watching Episode 2 last night and i thought of something. I believe that it all has to do with the abduction of C-3PO. Really. Now whether it was a gift from Lars, or if Anakin assumed ownership, or if he and Amidala just stole 3PO when they left Tatooine to rescue Obi they did take away a value piece of equipment from the moisture farm.
Now jump forward 20+ years to a New Hope. Uncle Owen finally scrapes up enough cash to buy 3PO back so he can use him to program the evaporators. His plan is that after the current season they will be far ahead enough that Luke can go off and join the Academy and thus join the Empire. Now if 3PO had never left Tatooine it can be speculated that his services would have greatly helped the farm. 3PO’s did not play a vital enough role in the clone wars to avert the things that happened thus Luke would still have been born and would have been returned to Uncle Owen. The thing is though that Uncle Owen would now have a much more successful farm allowing Luke to leave for the academy much earlier. Also there would have been no need for Uncle Owen to buy the droids from the Jawas so the Storm Troopers would have found R2 with the Death Star still intact.
Alderan would still be destroyed but so would Yavin-4. There might have been a battle but it would be with Luke leading a squad of Tie Fighters…he would probably have shot down his good friend Biggs. Eventually Darth Vader would have come across Luke and figured things out and would have been able to train him as his apprentice. Luke would have gone along because he would not have had the positive training from Obi Wan and Yoda. They would have destroyed the Emperor and ruled the Galaxy as father and son.
But none of that happend. 3PO left Tatooine. And the world is a better place for it.