In your opinion.
I could have got a D750/D610 for less than the D500 was, but I didn't because I didn't want FF. If I wanted I could get a FF camera any time I wanted, but the D500 and the lenses I have I am happy with. As soon as I felt the size and weight of a Nikon D2X many years ago, I knew that style of body was not for me, and subsequent Nikon D* series cameras I have handled over the years have not changed my mind.
FF, and the large and heavy lenses that need to go with it, I don't want to carry. If I were going to the fictional air show or motorsport event I may hire a longer lens if I felt I needed something longer than 300mm, but I would be using the D500.
FF is not the aim of everyone, not even all of those fiscally challenged.