The GFX is the reason I didn't get the X-T2 because for me THIS will become the workhorse camera, replacing how I had used the X-T1 for its battery grip, tilting screen, tethering etc in situations that needed it.
I did get an X-T2, but this thought was (is) definitely floating around in my mind. I’m trying to figure out a way to get a GFX 50s with the GF 32-64mm F4 LM WR as a starting point. $9K though. Cheap for medium format, but a serious stretch from an X-T2 with XF 16-55mm F2.8 WR, for instance, at $2,900 with the grip.