Earlier quoted context omitted.
>fans of the iPhone 4/5 series (like me) Maybe this group that you described is a small minority now?
IIRC the iPhone is the most profitable consumer product ever. If anything, it should be able to support a greater diversity of models than it does. Because even the "small minority" slices are still large in absolute terms. For instance, I'd suppose a niche iPhone could still be more profitable than, say, the new Mac Pro, which is expensive and looks cool but doesn't sell that many units.
If that's true there will be 5 distinct iPhone models released in one year, which I think is a new record for iPhone model diversity.