Nikon Z8 and D850 wanted features

Nikon is going to make the Z8 and the mirrorless version of the D850, both 60.8mp cameras that look like they will use the Sony A7RIV sensor. Since they are using the same sensor and are coming out with a camera a year later, I think they should try to make an upgraded version of the A7RIV. I think they both need 4k@60. The D850 replacement should have 1 SD slot and 1 CFexpress slot whereas the Z8 should have 2 CFexpress slots. I don't think 8k is necessary because very few will use it, I would opt to keep the camera cheaper than to add 8k. It should make 20fps Electronic and 10fps mechanical shutter and Eye AF and Animal Eye-AF.