I can see a market for what you want - at a price around $/`£3000 - if it can be made with Z9 ability.I need a camera that can help me get 750mm compositional reach with my 500mm PF lens, right out of the gate. (Plus, $4,000 for a new camera body is still a little bit steep for me.)
Anyone else here hoping/waiting for a D500 mirrorless successor? And if so, do you think it will come out within the next two years?
As Nikon is taking 18 months to release the Z8 after the Z9; unless Nikon speed up "high end" camera body releases a currently mythical "Z90" if next in line could take around 18 months.
I expect a Z6 III with around 30 MP and either a Z7III or a Z10 with around 60 MP will come first - making 2 years for a "Z90" optimistic.
Back when Nikon FX was 36 MP and DX was 24 MP I found using DX alongside FX to put more MP on a subject with very little image quality loss at low ISOs - DX was a lot more affordable than fast long lenses.
With ML viewfinders being dramatically brighter than DSLRs, relatively affordable long lenses such as the 400 f4.5 and 800 PF combined with Z teleconverters loosing less image quality than F converters - in a much "smaller advanced camera market" than 5 years ago - if you were a Nikon executive would you develop a 600 S PF and upgrade the 500 PF to S - or develop a "Z90" with around 33 MP?
Although 33 MP DX exists some reports say as of now it distinctly slows up camera performance.
If Nikon introduce a "Z90" 33 MP with Z9 performance I would buy it.
If it comes I do not see one inside of 2 years.