I noticed back in the 70's regarding sitcoms, that suddenly the smart people in the room were the children. And then in the 80's, the dumb people in the room were the men. But that is, honestly, to be expected. The primary intended audience of sitcoms was women. Men mostly watch TV for documentaries, movies and sports. Though I used to love The Man From Uncle, The Streets of San Francisco, The prisoner, etc.
In fact, I just started watching Mannix (which I loved back in the day). I'm into the third episode. I forgot how good that show was. And So was Rockford Files. The stories are great (though some of the guest actors SUCK), and the photography in Mannix is way ahead of its time. I'm guessing it was eventually cancelled simply because it was too expensive.
BTW, the movies in the 60's and early 70's all featured a single dad, and then they switched to all single moms. Again, since the target audience is women, that makes sense.
Examples, "My Three Sons", Courtship of Eddies Father, Family Affair.
Television shaped generations. Fortunately, mine was shaped by shows like Leave it to Beaver and Father Knows Best. The whole thing devolved into shows like The Simpsons, Married with Children and Family Guy.