The only way X will be EOL-ed this year is if there is an upgrade with an identical design, but improved internals. Like, when 5S replaced the 5, and 4S was still selling. Or how iPad Pro 2nd gen replaced the 1st gen. Apple either replaces one model with a more advanced one of the same design, or keeps both.
Most likely, they will not sell X and X II (whatever it's called) side by side, because that would mean they have to drop the X tech in price. I don't think the key technologies like Face ID or OLED screens are going to be advanced so quickly, so that "last-year tech" can drop in price. Most likely, Apple will improve certain things and replace the X with a new X that has a faster CPU, better cameras and that's it. My guess is, the Face ID tech will stay the same this year, and Apple will sell minor upgrades of X and 8 (the "S" versions) this year. X "Sequel" will probably replace the X while 8S will sell alongside 8 and 7 (7 replacing the 6S). We might get an SE 2 that will replace the SE.
If that is EOL, then ok, but that has nothing to do with "poor sales". It has everything to do with the fact that Apple is probably not going to offer "last year's X" for $100 less. Sure, I could be wrong, perhaps they sell both X and X Sequel, but I doubt it. Either way, it's not EOL because of "low demand" - there is absolutely 0% truth about that. Zero.
My guess: this year: 7, 8, 8S and "X II" or, perhaps, 7, 8S and "X II" (8S replaces the 8). Next year: 8S, "X II" and an evolved design for "X III" with, possibly, improved Face ID tech. Year after that: no more Home button/Touch ID iPhones. Transition complete.
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They won't.