I'd argue that given the choice of screen sizes, very few people would pick the 4.7"-5.5" iPhones. Samsung and other companies have been selling oversized handsets for over 4 years, and yet more and more consumers were still choosing the 3.5"-4" iPhones.
Again, because Samsung phones don't run iOS. Even so, many iPhone users abandoned ship in search for larger screens, and almost every iPhone user I knew always said they wished apple just made larger screens. MAYBE a 4" iphone would still sell decently, but 3.5" is completely out of the question.