Lear was the leading edge of the destruction of wholesome and popular American television. Shows like The Andy Griffith Show were canceled and replaced by All in the Family and others almost overnight, despite the fact that they were incredibly popular and morally edifying.
The Rural Purge
https://en.wikipedia.org/wiki/Rural_purge
Andy Griffith left "The Andy Griffith Show" in 1968, "All In The Family" debuted 1971. OTOH "Mayberry RFD" was indeed cancelled as part of the Rural Purge or Hickstallnacht or Exurbageddon or Appalachidoom.