Great products don't need to be replaced often!
Of course there is a Slump my Nephew uses my iPad Original (ordered on day one), My Brother in law my iPad 2 (bought on day one) and I am happy with my 3rd generation (bought a few months after release for a development project that need the high res), they all still run well, they don't need to be replaced as often as a phone for that matter I doubt I will upgrade from mine or my wife's iPhone 5 to a 6 because that is running real well too. So I guess some who only look at todays bottom dollar would preach doom and gloom but, I will never buy an android and there is no need to upgrade a product that just works GREAT. The next Laptop I buy will be an mac book pro (again), the next desktop I buy will be an iMac 27" (again) and all of my mobile devices are Apple as well with no plans to change that either. Apple will be fine those people buying new devices every year can waste their money any way they want, while I get some real use out of my Apples.