1. Anakin/Vader are major connective tissue in the saga, literal or not. 2. Han Solo, the anti-hero, didn't believe in the force and was unable to be tempted for lack of force ability. His story is, in part, sinner to saint, but always with an edge. 3. Selflessness vs. Selfishness are at the core of human existence and struggle. There is nothing wrong with that theme. It is how that theme is explored through relationships I.e., father/son. That could be redundant. Agreed. What "OTHER" problems will the protagonist(s) face? How to balance their checking accounts? It has to be a challenge core to existence. Thus mythological. I could envision a Vader doppelgänger or a number of the them that terrorize our heros. Not unlike the Ringwraiths in LOTR. I could see how a writer could set up a Jedi Army with force ghosts, battling an army of Sith with Anakin battling his alter ego, Vader, in some kind of epic ending to the saga. Probable? I don't know. A possible direction or at least discussion at a writers conference? Certainly.