If the Android makers thought there was profitable revenue in smaller-screen phones, they'd be on that. They're not Apple. They roll out new models often.
If you believe what you're trying to imply, don't buy the new ones from Apple. Just stand by. If there are enough that do that, Android will try to fill the hole left by Apple and Apple will realize their "mistake" and probably roll out a 6 or 6s at 4". But personally, I don't expect that to happen. Sure, there will be a handful whining about the potential end of "one-handed use" and refusing to buy >4" even if Apple tries to pull them on up to 4.7". But once Apple formally endorses the new sizes as the new "chosen" sizes, much of those arguing similarly now will just go right with Apple.
We already saw this happen in the hop from the formerly "perfect" size of 3.5" to 4". We even saw a lot of the same arguments against the 4" iPhone rumors. Then, Apple rolled out 4" deemed as the new "perfect" while taking pokes at Androids bigger than 4" as too big. What did the 3.5"-or-bust and "Apple would never" crowd do? Jumped right onto 4" and gushed about it. It will be the same this time. Gripes, complaints, "need bigger pockets", "one-handed use", "fragmentation", blah, blah, blah right into the launch
then, "shut up and take my money", "how did we ever get by with those puny screens", "best iPhones ever", "
but as soon as I actually got to see one", etc.
And apparently, all of our pants pockets will magically evolve overnight.