After the violent and traumatic year of 1968, networks almost completely replaced its current shows with "relevance"-- "Many looked different. Black, brown, yellow faces became comon in drama, newscast, commercial, comedy, special event, panel." (431) This shows the change that television was making by including different ethnicities and cultural differences- not just focusing on the stereotypical "norms" of society.
When shows such as All in the Family and Mary Tyler Moore were aired, "innumerable taboos fell away." Barnouw states that "The essential strategy was to seize on topics and relationships involving deep tensions, and introduce them in a comedy aura . . . Interracial marriage, a young man's siege of impotence, an older woman's pregnancy and indecision about abortion, were suddenly topics of warm comedy..." (434)

Normal Lear, "the leading spirit behind the series [All in the Family]", thought that he was "enabling black and white, Jew and Gentile, to "laugh together." the explosive welcome won by his program among diverse groups- apparently inlcuding millions of those who were the butt of Archies expletives- seemed to support his claim." (433)
All in the Family also became the subject of a different series- The Jeffersons. "A black family first encountered in All in the Family became the subject of another new series, The Jeffersons. Maude's black maid became the central character of Good Times. The technique became a standard television strategem. Rhoda, introduced as a character on the popular Mary Tyler Moore Show- whose heroine was a television news writer- became the central character of a Rhoda series." (434)
Overall, I think these shows had a tremendouse impact on expanding viewers acceptance of different types of people with different problems instead of just giving them the stereotypical American family.
Check out this link, it is to Mary Tyler Moore's "Lost" episode!