Well, based on DXO, you would wonder why anyone would buy a D750 when a D600 is so much cheaper...
D500 is much like the D5 IMO. Not every crop shooter should buy a D500, just as not every FF shooter should buy a D5. They have their purposes, and I think people know if they need it or not. While the small drawbacks on the D500 may be insignificant in the real world, I gotta wonder if Nikon could have done a little less buffer space and upped another spec. Granted, they may not have been able to do anything without switching to the smaller (in file size) sensor, which probably brings the other things.