Allen Pike (via John Gruber):
The only thing we can do as developers to disavow support for these devices is require a version of iOS that won’t run on them. Unfortunately, Apple will surely continue support for the A5 in iOS 9. If they do so, we won’t have a mechanism to cut off support for these old iPads mini and iPods touch until iOS 10 has reached wide adoption, likely in early 2017.
The original iPad mini is surely the new iPod Classic (or Mid-2012 MacBook Pro in 2014) of Apple’s lineup.