I would not have done the prequels period. i would have moved the story forward and show Luke After Return of the Jedi. I would have done a sequel trilogy with at least Mark Hamill if not Ford and Fisher. But this would have had to be done before they were too old as they are now.
I still Believe if a new movie project went forward at this time Hamill could be the Alec Guiness Type passing on the torch to a new generation of jedi.
But that would mean either incorporating More EU garbage into the main star wars or Lucas creating his own new characters, Like His own Version of whether or not Leia and Han had kids that became jedi and so forth.
Kind of sounds like the new Star Wars book Outcast. I have yet to read it but it takes place 40 years after ROTJ.