In 1982 my old 35mm SLR failed, and it was clear that repair was not feasible. I did an exhaustive study starting with identifying my needs and wants, and then comparing those with the capabilities of all commercially available 35mm SLRs at the time. Made a decision to get rid of my old system entirely and start over with Nikon, centered about an FM-2. One of the factors on my wish list was for a system that would last a while, and the decision to go with Nikon was clearly correct since that system is still functioning very well - several thousand rolls of film later.
I also have an Olympus rangefinder that I purchased in 1978. It it a bit beat up - there is a serious dent on the top plate from the time that I dropped in on the pavement at Ghiradelli Square in San Francisco, and the self-timer lever got lost years ago. I've been using the same mercury battery since 1998 - but I have four spares for when it eventually fails. Have probably put a couple hundred rolls of film through it.
Four years ago, however, I did purchase a new camera. It was a 4x5 field camera. I fully expect it to last longer than the Nikons.
The beauty of these cameras is that they share something with the old slant-6 Plymouth my wife had when we got married - they are so basic that there's essentially nothing to go wrong. On the other hand, the Plymouth was a piece of junk that wouldn't go uphill. Can't say that for any of these cameras - they are real workhorses.