I probably could have updated this sooner, but here's the update on my old QX4. It's now 100% guaranteed that I'll never get it back, pretty sure it's scrapped. I saw it pop up for sale a few times over the spring, with the price slowly decreasing. Eventually I began to see listings on Facebook for it being parted out, and now all signs of it are gone. It kinda sucks, but it seems appropriate. The unibody held up the whole time from what I understand, but I can't imagine the strut towers had very many more miles in them.
From the final for sale posts, I gather that it was ran very hard towards the end, as it had a busted passenger side mirror, some body damage, and a hyrolocked engine. At least it went out in 4x4 with mud flying! Seems very fitting, a very different end to it's mechanical life than where it started on the luxury car lot. Just figured some of y'all would appreciate a final update, and it does finish up this thread finally. I believe I have screenshots of some of the for-sale ads, which I'll add here when I find them.