Many features don't require newer hardware. How long is it reasonable? One of the reasons I have heard about people buying Apple hardware is that it has great

Many features don't require newer hardware. How long is it reasonable? One of the reasons I have heard about people buying Apple hardware is that it has great resale value. So the answer is: Long enough to keep this true. If Apple keeps its current path, people will stop buying Apple hardware and it will hurt Apple's bottom line. But yes, I concede they have the money to make mistakes for about 20 years. So they do make the mistakes.