I have loved the form factor of the iPad mini since the day it came out. (And remember, the iPad Air 1 wasn't out yet at the time, so the mini was unique in form factor for a little while.) I got the first gen model for my wife shortly after it came out, and she quickly ditched her Kindle and hasn't looked back. I also owned my own mini for a while--it now also belongs to my wife--but once I started looking into making the iPad my main computer, the mini just wasn't going to do it for me any more.
There are a lot of theories out there that the decline in sales of the iPad for the last few quarters has been largely due to demand for the iPad mini drastically shrinking. People may or may not agree with that, but there are definitely numbers to back it up. I think there are two main groups of people who have stopped buying the iPad mini: 1) People like me who want the iPad as their main or only computer, and 2) people who have switched to Plus model iPhones and think those are biggER enough to not need a mini any more. (Yes, I realize the mini is actually way bigger than a Plus iPhone, but the perception in the market is that they're close to the same size because that's what the media constantly tells people.)
I had been on the fence lately as to whether or not Apple would "kill" the mini, but I'm not so on the fence any more--I think they're clearly signaling that the mini doesn't have much place in the product line any more. My theory is this:
If the fall product launch comes and goes with no iPad mini announcement, we will know that mini sales have either fully tanked or have mostly been replaced by sales of the 2017 9.7" iPad. If there is a mini 5, or maybe a 2017 mini that's just a shrunken down 2017 iPad 9.7", we will know that mini sales have hit a bottom, but not enough of a bottom where Apple doesn't think they'll still sell loads of them during the holidays, which is usually when iPad minis sell really well.
Just my opinion, but I think the writing is on the wall here.