Possibly this may be done to make a dvd release of all the missing later seasons, uncut, far more marketable to the fans of the show who are hanging out for the release of these seasons....one day....
I have the season 5 and 6 sets on dvd and would get the rest of the show in a nano-second if it went on sale, even as a manufactured on demand title.
I think all 'Dick Van Dyke Show'/'Andy Griffith Show' completists would want the rest of this series (including "Make Room for Grandaddy") --...