I think that was his "original" intention, but that he changed it. I just remembered the interview with Lucas on the special edition DVDs, where he said that he had wanted to redo Star Wars for its 20th anniversary, but he had such a good time doing it that he decided to go ahead and redo the rest of the trilogy as well. It's Lucas, so take it with a grain of salt, but maybe he hadn't made that decision in 1995. Either way, it looks like ESB and ROTJ fit into the category of movies we're not going to get.