As a Z7II owner a full frame retro styled camera with dials and essentially an upgraded Z7II would be awesome, the issue is Nikon doesn't really have lenses with aperture rings no?
I use a retro style Fuji X series body and would than welcome a Nikon retro style camera as it would likely improve upon the Fujifilm's shortcomings - low light IQ and AF.
Fuji have the prime lenses with aperture rings that pretty much compliment their cameras perfectly. I doubt Nikon will release lenses with aperture rings and the Z lenses won't really pair up well with a retro style body, which is the only real negative.