I am already receiving small bits and pieces of information on the rumored Nikon Z5 camera. The latest tip indicated that the Z5 may not have an EVF (it could be an optional accessory) – maybe something similar to the Sigma fp:
The EVF for the Z5 could be an optional, removable accessory similar to the Fuji GFX 100:
Canon also has a similar solution with their Canon EOS M6 mirrorless camera:
Nikon has filed several design patents for a camera without EVF (or with removable EVF):
FYI: the Canon ERO RP entry-level camera is now selling for $899.