Safe to say that it won’t be for quite a long time, but things go in and out of fashion all the time.
At one time it was Apple having the opposite problem, people demanding bigger and bigger and bigger and bigger phones, and Apple stubbornly sticking to 3.5-4 inches while the competition thrived with anywhere from 4.3 up to over 6 inch screens.
Then the 6 and 6+ launched and became the best selling smartphones of all time.
So if there grows a large demand for smaller phones in a couple years, I’m sure Apple will eventually follow.
But honestly, I don’t see that happening.
With the abilities of the Apple Watch and AirPods growing every year, and with both of those products being smaller than an iPhone mini ever could be, I think you’ll see Apple point mini iPhone enjoyers towards those devices as a “more portable and less cumbersome” alternative to big iPhones, and I think the lines between what’s an iPhone and what’s an iPad Mini will continue to get blurrier and blurrier.
It’s the exact same thing they are doing with the Mac right now.
Why buy an iMac pro when you can buy a Mac Studio and display?
Why buy an iPhone Mini when you can buy a big iPad sized iPhone for home and an Apple Watch and AirPods for your portable needs?
That’s the way you’ll see it spun, and even though I don’t agree (I love my 12 mini and would rather a 15Mini exist than a plus) I still think it’s gone for good.