Just imagine if Anakin was a dashing, charismatic hero, and was of a similar age to Obi Wan, and we could see their exploits and daring together, and not necessarily regarding the uninteresting "Clone War(s)," but during some kind of actual adventures in an expanding universe, and then we could actually see and care about a genuine transformation into evil and betrayal.

Anakin should have been the Han character, and Obi Wan should have been the Luke, coming of age and developing by experiencing the betrayal and loss of a well-sculpted friendship. A love triangle between them and Luke's mother (only clumsily and vaguely hinted at in ROTShit) would have been nice, even if only due to Anakin's paranoia as he slid toward the Dark Side.

All of this would have to be handled by a competent screenwriter. George would never have it in him.