4th post nails it imo.
I've no desire for a small phone again, but there is clearly enough of a minority that are interested judging by that 30 million figure quoted by Apple in their keynote. Given that was 30m of a pretty old model, I see no reason why the SE won't completely eclipse that figure over a similar time frame. Although it lacks some headline features, the fast cpu/gpu/ram* and, crucially, the excellent camera means it's an attractive, uncompromised option if you don't want a big phone.
*I know, ram doesn't necessarily sell to the masses, but they're getting a much better experience because of 2gb. Apple never should have released 64bit devices with 1gb. The 5S was okay, but Air 1 & 6+ were the worst devices I've had had out of the box / unstable, constant app refreshing, laggy. The 3G was ropey looking back, but was killer for the first 12-18 months, helped probably cos we knew know better at the time.