Just read this excerpt from Rinzler's upcoming "Making of ROTJ" book (the discussion below is circa 1981): Kasdan: The Force was available to anyone who could hook into it? Lucas: Yes, everybody can do it. Kasdan: Not just the Jedi? Lucas: It’s just the Jedi who take the time to do it. From: http://www.huffingtonpost.com/2013/05/22/star-wars-prequels-return-of-the-jedi_n_3313793.html This seems to back up those who feel that the introduction of midiclorians represented a fundamental shift in the way the Force was presented and perceived (I am in this camp). Back them, GL himself thought that "anyone could do it".