Very sad that we'll never see what might have been. GL took the quick and easy path.
As far as the complaints about ROTJ posted earlier, I don't have the same problems with Jedi. Jabba allowing Leia to rescue Han could have been explained by Jabba finding more value in the entertainment to his guests than in keeping Han as a trophy. Leia responding that somehow she had always known about Luke being her brother, could be just some sense or feeling that something was different about Luke, but that now being told, that feeling made sense. Of course there are elements of Jedi that are weak, and there is the move towards being cute and softening the depth of the story. Even after seeing Ewoks though, who would have ever imagined Jar Jar? At least the Ewoks were cute and sometimes funny.
It definetely would have been interesting to see the ROTJ that would have resulted if Gary Kurtz had been retained as Producer.