Lucas seems to justify alot with "That's the way it was supposed to be."
Usually I don't buy it, and I think the majority of us here are of the same mind.
BUT... what if tomorrow, ol' GL came out with some kind of undeniable proof from 1972 that the way the Star Wars Saga is now is precisely how he intended. Say, he has an old reel of film of him talking to Copola, and he lays out the six film plots, including Jar Jar, Han shooting first, Anakin building 3PO, Jabba in Episode 1, and everything exactly like it is now in the SE and the PT.
Would this change your opinion of anything?