With the price of iPhones rising due to the US dollar appreciation, it will be interesting to see if sales drop. For people on contracts, like most people in Australia, they probably won't notice.
For myself, the iPhone 6 was the first device that replaced my camera and having a separate iPod. I used to spend more on a camera + iPod + iPhone (because the battery life was crap)
Nope. Never. As logical as it may seem for people to stop spending money to due to high costs, people don't shy away from spending just because the cost of goods rise. Look at cigarettes. I remember as child they used to be $.50/pack when my parents bought them. Today they are at least $5.00/pack and the tobacco industry is making more profits than ever on nicotine junkies.