I think personnally George maybe should have done the Prequels in the late 80s and early 90s because one of the issues I have with the prequels, is the prequels look so more advanced than the Originals and dont believe everything would go that to pot in 20 years under the Empire, then use the technology available for any possible sequels but he would still be updating the things even then
The problem was Luke and co may have not been old enough, and I am sure Harrison Ford wouldnt have returned, depending on what Lucas wanted to do, and Lucas has now left the end of Jedi pretty final with the Emperor dead (which I believe wasnt always intended for Jedi) and the planets celebrating the overthrow of the Empire(with Yub Yub something may have been possible) EU or no EU explainations..............