If Apple was smart, every 3-5 years they would produce a small phone form factor. Maybe two models, one with the pro features (that will fit in the chassis anyways). There's obviously a market, it might be small but a lot of people don't want to buy a huge phone.
Including me, I went from a 5 to an X and just did not like having something that big. Sure, it was nice to read and use the map in my car, but carrying it around in my pocket always sucked compared to the smaller one. I have a 13 mini now, and I'll keep that as long as I it is working...I'm considering finding a refurb and sticking it in the closet until the time comes, though I think mine can keep going since I keep it safe in a case, just a battery change in a couple years and the hardware should be good if I can keep my daughter away from it. A new mini phone will be a purchase in the future, odds are they can sell millions of those every few years if they produce it.