Where are all the people that wanted a new 4 inch iPhone?
All six of them decided to pre-order a Tesla instead (although you'll look even more ridiculous holding one of those up to your ear - but maybe the autodrive feature will be good for one-handed texting).
Or, they gave up and bought a 6s last year, stopped worrying and learned to love the phablet.
Lets see:
Q: Why do some people like 4" phones?
A: Because their main usage is phone calls and text messaging, for which a 4" display is more than adequate & still usable for the occasional bit of web surfing or video playing.
Q: Why do some people prefer 4.7-5.5" displays?
A: Because their main usage is web browsing, games, photography, watching videos etc. for which a large display and a fast processor are better, but the phone still fits into a shirt pocket or handbag and is OK for calls and texting.
Q: How do you sell phones when everybody has one?
A: Offer them a must-have feature that makes them upgrade.
Q: If your main usage is phone calls and text messaging and you already have a 4" phone that does these perfectly, why would you want to upgrade to a larger screen, faster CPU?
A: Er...
Yahoo for user choice, brand loyalty etc. - and maybe Apple should have made the 6 in 4" and 5" versions in the first place rather than big and bing'n'bendy, but its not a big surprise if the SE is not a big seller.