First, there were nearly a dozen variety shows at that time -- that type show had not yet begun to die out, though it would do so shortly. Alan would have been competing with, among others: Andy Williams, Steve Lawrence, Red Skelton, Danny Kaye, Dean Martin, Jimmy Dean, the King Family, the Smothers Brothers, Jackie Gleason, Lawrence Welk, and Ed Sullivan.
Sitcoms, however, were dominating the ratings, with "The Lucy Show", "The Andy Griffith Show", "Bewitched", "Gomer Pyle", "Hogan's Heroes", and "The Beverly Hillbillies" all in the top 10. Others in the top 20 included "My Three Sons", "Get Smart", "Green Acres" ---- and, of course, "The Dick Van Dyke Show" (on Wednesday nights).
Considering the fact that many of these shows can still be seen in syndicated re-runs almost 50 years later, it's safe to say that the '65-'66 season was a strong one -- and that Rob, Sally, and Buddy were doing very well if they were keeping an obsolescent program type in 7th -- or even 17th -- place.