The iPad Mini 3 would have made a lot more sense if they included NFC support for ApplePay in it. That would have actually been a compelling reason to step up to the current generation model.
I get the lack of the CPU upgrade for the most part though, given that the A8 is mostly a faster-clocked die shrink of the A7, and the A7 was already faster clocked in the Mini last year.
On the Mac side, Intel's fabrication issues are really starting to hit home. Another three or four months until there is anything interesting happening with a hardware upgrade, and for the most part, even then, it's only going to be a GPU upgrade and better battery life, and yay, a smaller form factor, but really nobody cares about that.