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about 15 years or untill major components start failing,
I'd state that as all components, major and minor, start failing. The problem with the minor stuff is that it's so expensive for very little, but vital utility.
Today a very clean Chrysler LHS ..beautiful leather interior ..clean paint... everything, had worn out nylon bushings in the wiper linkage. No bushings available and the linkage arms were about $160. Most of the usual accessory mechanical items are available reman (pump, calipers, CV joints, etc.) but some single piece 12' long corroded fuel line that requires special tools and techniques to "refab" jacks the $2 repair to a $200 repair. While I can live with "work arounds", the average consumer:merchant relationship doesn't allow it and time is at too big a premium in vendor "re-engineering".
Buying used 3 year old stuff and keeping it 5 years is not a bad plan for maximum convenience and reduced costs.
That said, I'll keep my jeeps until I can't afford fuel for them. The parts availability should be well beyond my lifespan otherwise. I can throw any number of trans/t-case/axle combo's under it ..and the rest can be hacked or mod'ed as needed ..as many have done everywhere with ample documentation.
There are "anxiety factors" with some people. My wife is one such anxiety driven being. If there's a problem, she can't stand it. Stuff like getting a rental and whatever far cheaper alternative just isn't in the mix. It "gets in the way" of her otherwise (my term) "saturated" life agenda. I manage to cope with having her drive mine while I manage the "trouble free" existence.