But recall that DS didn't end because of low ratings.
It didn't? What then?
Why Was The Original DS Cancelled?
CBS got rid of all of its hit rural-themed shows (Beverly Hillbillies, Hee Haw et al) for the same reason, plus they wanted to change their image to a more sophisticated image. So, out with Jed Clampett and Aunt Bee, in with Archie Bunker and Mary Richards, or as Green Acres' Pat Buttram famously said, "They cancelled everything with a tree in it".