Yes, Apple gear holds its value absurdly well, so with a price increase for the new gear, the old gear could potentially even hold 100% of its purchase price, given the higher prices to get the better new-n-shiny.
As for me - I’m still guessing what I’m going to do. Wife’s and my iPhone 5S are getting painful (ie battery and age). Was thinking 6S, but that just seems ancient now, even if it’s basically at the “right” price point. Maybe there will be a flood of 7’s hit the market and actually bring it down in price, but as per above - doubtful.