This pricing is consistent with existing Canon (5D III/IV vs. 5Ds R), Sony (A7 vs. A7R), and Nikon (D750 vs. D8x0) pricing for "regular" and "high resolution" models.
That I understand but those are different cameras, eg the D750 has consumer specs (with all due respect) whereas the D8x0 can do the pro stuff like 1/8000th shutter, 10 pin connector, etc and the a7R models has the premium EVF, LCD, all metal vs plastic build, etc over the a7 models.
Let me turn it around, if the Z7 is the premium model at 3400 bucks you are getting a whole lot of camera for 2000 bucks with the Z6 as the only difference seems to be the sensor
Personally I am in the market for the Z7 to continue the high res journey which started with the D800E, a7R and the current a7RII.
The low res and high ISO journey which started with the D700, D3s and now the a7S will end soon when I sell the a7S as the high ISO performance provided by the high res cameras has been sufficient for my use since the amazing sensor of the a7RII (which should be superseded by performance of the Z7).