Expand the class options to allow non jedi that can finish the game... and still not be a jedi.
I'd love to play as a droid mechanic or a out and out rogue with a Jedi or two in my party rather than having to be the one holding everyone's hands all the time.
I've always felt there was so much more to the Star Wars universe than mystical powers and lightsabers. If you must stll have giant sith battles you could just party manage to deal with them. This would also mean an end to cliche one on one battle's at the climax.
War never changes.