Twilight Zone could’ve gone on forever because it was more of an anthology than a series.
They brought it back in the 70’s for a season or so. I remember a particular episode where a woman, during a storm, ends up at a house where the adult couple are actually her toddler son all grown up with his wife (i.e. time travel). He pulls out this box about a foot square and punches in her address and rows of lights appear on it showing her the route home. She is duly amazed at the concept as was I as I watched it. I think about it from time to time as I look at my android phone on the dash telling me where to go.
We really do live in the future, you know.
Laugh-In could have gone on forever. Sophie Vergara saying “sock it to me.”