If they keep 4" they would capture basically everyone who wants that size. The question is not if there are people who want 4", it's is the amount of people worth the attention and the added costs? Only Apple can answer that. And I think almost everyone will get used to 4.7" soon after using them. So the need for a 4" is probably a bit overstated. Most people will probably adapt, and people who absolutely need 4" will be ignored, but that's what happens when you're in the minority.
They may just keep the 4" around for the low end as a tradeoff people need to make if they need to have that. The same way they kept around the iPod classic for so long. They didn't make any improvements, and charged a lot for what it was, but the few people who had to have it bought it anyway.
They may just keep the 4" around for the low end as a tradeoff people need to make if they need to have that. The same way they kept around the iPod classic for so long. They didn't make any improvements, and charged a lot for what it was, but the few people who had to have it bought it anyway.