The mini is my favorite iPad size for casual consumption, which I think is where iPads shine brighter than any other device. But I don't think Apple agrees with me about the mini. It's a bit of an oddity in Apple's iPad lineup. It's the only iOS device size that doesn't have its own pixel resolution. It was released after the 9.7 with a simply shrunken 9.7 UI. It really seems like it has always been an afterthought. Now that Apple is pushing the iPad Pros, demoting the 9.7" iPad, keeping around only one model of the mini, the future of the mini is very questionable. It's a real shame.
What would be great is if Apple took this chance to rethink the small tablet and give it the proper attention it needs. I'd love for it to be even smaller. Something more like 7" 3:2 (iPhone original aspect ratio) so that it's easily graspable. A little bigger than a phablet, for someone who doesn't like big phones. And give it its own optimized resolution and UI. Wishful thinking, I know.