I believe that mainstream country turned to shit in the 80s, not sure why. My theory is that it’s down to the money men in Nashville turning out an increasingly phony product for commercial reasons, but I don’t actually know enough about that aspect of the business to have an informed opinion.
Fortunately there’s always been legit musicians turning out excellent alt-country or Americana, or whatever we want to call it. Also a lot of the older country musicians never completely sold out either.