As a Nikon user, with both mirrorless and DSLR cameras, I find myself in the situation of not knowing when a replacement / upgrade for the D850 is coming out, or even if one is coming out at all. Nikon also seem to have stopped planning any more F lenses. Everything now seems to revolve around their Z mirrorless system. Why is this?
The problem is that none of their Z cameras is as reliable or fast as the D850 and the battery life on the D850 is way in advance of the mirrorless cameras. I suppose one of the arguments for mirrorless is that they are smaller and lighter, but not everyone wants a smaller lighter camera. I don't.
For this I'm using my DSLR's, D850 and Df. I tried the Z7 but it is so slow to start up that I was missing shots, particularly when a fast express came hurtling through the station. The DSLR's are completely different. I point them at the train, they instantly focus and I get the shot in a fraction of second. Now this is unusual for me as I normally work quite slowly shooting landscape. But when I needed that speed my Z7 didn't give it to me.
It now seems that Camera Companies are determined to concentrate on mirrorless only in future. Personally I don't think that this will be the financial solution they are looking for, or will increase sales. In fact I suspect the opposite will occur as all those people used to DSLR's will not rush to 'upgrade' to a mirrorless camera. Nikon are apparently working on a Z9 top of the range mirrorless camera. But it will certainly have to be a lot better than the current Z range to tempt me away from my D850 or Df.
Not everything that is new is better and not everybody wants more controls, more options and the resulting complex menu systems. In fact one of the reasons I love using my Df is that it's simple and easy to get the results I want. There used to be a joke that the first rule of being a man was 'If it's got more knobs it's better' however not all of us are sawdust heads and I for one feel that I am being ignored. I just hope that my D850 and Df keep going for many more years.