This is not true, see quote directly from Cook:
"While Greater China and other emerging markets accounted for the vast majority of the year-over-year iPhone revenue decline, in some developed markets, iPhone upgrades also were not as strong as we thought they would be."
He says iPhone upgrades in developed countries were also not as strong as Apple thought.
If you read in between the lines, it's clear that pricing is the main issue, look at this other quote from Cook, he mentions 3 reasons, all 3 reasons have some relation with money:
"...we believe there are other factors broadly impacting our iPhone performance, including consumers adapting to a world with fewer carrier subsidies, US dollar strength-related price increases, and some customers taking advantage of significantly reduced pricing for iPhone battery replacements."
Pricing is the main issue. Wake up guys, worst mistake Apple and everyone can do is be purposefully blind to the real issue.