The Mac Minis were almost certainly coming over three years ago. They did, in due course, albeit not to every geek's liking in 2014. None the less, they are still on sale, and are fine for those on modest budgets with modest requirements. The Mini has never been a leading edge product; tends to follow the MacBooks it is based on. Apple have indicated that they have no plan to drop the Mac Mini, so we must assume that a new iteration is still almost certainly coming.
Those are my similar thoughts. The Mac Mini has never really been a top-of-the-line priority with Apple and it seems to lead behind the MacBooks. That said, nor has Apple definitively discontinued the mini, which I see a future iterarion somewhere around early 2018.