Well I for one sold my K3 and went for the KP, only to sell the KP and go for a K3II. And accept its limitations.
I now see the K3(II) as the pinnacle of an evolution towards a very good wildlife/birding camera, save for a limited higher iso performance and a limited AF system.
But to me it was telling that I now am at peace with the idea of using the K3II until I am ready to step up to another brand (that inherently costs a lot more
)
So sure, there is a psychological element in the drive for a perpetual upgrade, only to find that you might have already used a very good to best possible camera in its class (if it comes to enjoying the images it produces). I am no longer that convinced that the next flagship will be better than the K3II. Sure, in some regards, but in others? It may be different, and I may like its IQ more or perhaps less than the K3II. But even seeing lots of images from a camera like the D500 (or the older 7DII), I am not so sure that I would gain a lot switching to one of these cameras IQ wise. It would be solely for the better lenses in the super telephoto class and for the better AF.
Anyhow, I am no longer "waiting" for a K3II successor.....
Chris