I think Apple knows what it's doing in terms of demand. Its not as if going to the engineering trouble of bringing out two gorgeous larger format phones was a rash knee-jerk reactions to a few vocal pundits. They waited a long time and the mere fact that Apple has brought these phones to market will in itself help make the larger sizes more acceptable and therefore increase demand. But I doubt the 'old' size will disappear, all of a sudden, so no worries for you.
9/10/14 at 8:26am