@brandonlee Poking around, I think I'm going to consider the idea of abandoning full-frame. I think if I was going full-frame mirrorless, it would be a Z6, which would be about $1000 to start (Nikon has a trade-in, I could keep my lenses and trade in my D750 to get a Z6 + lens adaptor).
Looking at the Fuji X-H1, and seeing the rumors that the H2 might come out soon (the H1 came out before the T3, so it's missing some key things), I am going to wait and see. If I can get an H2 and the $500 35mm Fuji prime lens for ~ what I can trade in my D750 for, I'd be tempted. The IBIS alone might be worth it.
On the other hand, I'd want to touch it first; the H1 seems similar in size to the D750. So who knows.