The Harris/2024 stories underscore that this is the first time in 40 years there's been a real chance a president would decline to seek re-election. An NBC report from the last time, early '83, when there was "a growing opinion in Washington that Mr. Reagan will not run again":
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Back then, it was thought that VP George H.W. Bush would have a leg up if Reagan declined to run but would not have a clear field on the GOP side. A February '83 poll found Bush the first choice of 23% of R's in a non-Reagan race, just 3 points ahead of Howard Baker:

Nov 15, 2021 · 4:00 PM UTC

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Of course, Reagan ended up running and winning a 49-state landslide, and his '82-'83 political vulnerability -- which was very real, thanks to a recession and questions about his age -- is largely lost to history
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Replying to @SteveKornacki
Some added context - in 1982 Reagan looked vulnerable as a result of the Recession though one can argue Kennedy's decision not to run suggested he was stronger than appeared. Unemployment dropped rapidly in '83 and Reagan's approval rating recovered as it dropped.
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Replying to @SteveKornacki
Comparing Bush vs Baker to today’s GOP brings a tear to my eye.