I was about to comment that an important feature for "longevity" is the storage amount. But I also carry my music collection yet. Still not ready for Streaming. So 128GB is a good size for me.
Nobody really knows how long Apple will still support the OS on their older phones. The 5/5c being dropped was almost a no brainer after the years they were supported due to 32 bit CPU. But what is next?
You might argue 5s/SE due to 4" screen. Drop those, and make life easier for app developers. But the SE is still being sold on clearance, and performance comparable to the 6s.
My argument would likely be the 1GB RAM models are next. The 5s/6/6+. But this year or next?
After this, the next logical break would be limiting it to FaceID compatible phones, but only several years after they stop selling TouchID phones.
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I went for the XR, I could get an X for the same price but second hand you’re dealing with a year old battery (and the XR has better battery even when new) and the XR offers newer features like the upgraded camera. Oh and I love a bigger screen. Don’t be mislead by screen resolution or the LCD vs OLED debate; they’re both fine.
If I was buying new now, I would seriously consider the Xr. The price difference between it and the Xs is too big right now. But not good enough for me to trade in my X for.