Maybe I exaggerated with a year.

However, here in Scandinavia the price increase the last 2-3 years has been fairly extreme. For example, Apple has priced themselves in large part out of the public school system in our country, and more markets will close up in the future. So far, this pricing policy doesn't seem to harm Apple very much, since they are a world market company. I still think there will be a backlash at some point, as more and more people will have to use either older models from Apple or other brands. The fact that more and more people are buying older models from Apple is a fairly new development, and not exactly a good thing.
I hear what you’re saying, but there’s another dynamic in play here, in that the year to year jumps in performance are becoming less noticeable. There was a time, say iPhone 5 (A6) where every year there was a significant increase in CPU/graphics performance. Through A9, you could make a case for upgrading yearly, or at least every other year, and be getting rather a faster phone.
But nowadays, people are keeping their iPhones 2 and 3 years, and even people with an iPhone 6 are saying they’re waiting another year. No, of course iOS 11 isn’t going to run as well as it does on an 8, but the 6 is already 3 years old (and it’s 1 GB of RAM is also quite a hindrance).
I have a 6s, and iOS 11 runs as well as iOS 10 did. I really do consider the A9/2GB platform is at a “good enough” point, and it’s no coincidence Apple is still selling the 6s (along with the SE and new iPad). I’m guessing Apple plans on supporting these devices through 2020 (max iOS 13? 14?), or else they wouldn’t still be selling them in soon to be 2018.
I expect them to drop the 6s next year and the A10 (iPhone 7) will become the minimum platform going forward, and also expect a same form factor refresh of the SE (and iPad) to A10 as well. Maybe a price drop for iPad to $299, which psychologically is a much better price point than $329 but it’s already a steal—no other tablet comes close.
Incidentally, those expecting an X version of the SE don’t understand the SE’s positioning in the Apple lineup at all. An X in the SE form factor would likely have to be priced at around $899, and that’s not going to sell in any meaningful quantity. A Plus version of the X, yes, and it’ll be $100-150 higher than the X.