In general, most shows get stale because they are set to an original format and eventually there is only so much you can write about one scenario. The longevity of this show is that it is topical changing with the time, but this is a problem with many in our age range. Though the show keeps on changing many of us as much as we try do not.
If you're going to compare longevity, you cannot compare it to a situation comedy you have to look at it as 60 minutes where over the years the hosts have changed, and the show keeps up with current events.
I worked at NBC in the 70's and was offered to run my department on the show and turned it down because it was too time consuming, and I was young and had a life outside of work.
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