It is interesting to see that the major reaction to the introduction of the Z8 is to wonder whether Panasonic will introduce a S1ii. I am wondering whether this market is so small overall that it is better for the manufacturers to specialize in a specific segment. Having Sony/Canon/Nikon/Fuji/Panasonic (Pentax seem to have stopped competing at this point) all producing a full range of cameras addressing identical market segments seems a little less likely given the reduced size of the overall market. Panasonic dominated the M4/5 segment of video/still cameras for a long time and their push into full frame seemed interesting if not a little odd until you saw what they produced. Their S5 seemed in line with a competitive full frame camera with very good (and high end) video capabilities. Pushing into the professional full frame photography market seems to be unlikely to me even though they started with the S1 series which were no more than adequate when compared to the competition (speed, autofocus, size were all issues cited for their lack of marker penetration).
My feeling is that Panasonic would be better carving out a market not addressed by Canon/Sony and Nikon. Fuji have gone their own way into very high resolution medium format cameras with which none of the other players compete and have a unique range of APS C cameras which are a joy to use due to their legacy appeal. I am also interested into why we must commit to a specific manufacturer. Is it the glass investment or is it the philosophy built into how the camera handles. Is it not reasonable to have one camera body and associated lenses associated with, say, landscapes and other high resolution needs, another for street photography, another for portraits etc. I know professionals do this, but what about the prosumer? I have a Fuji x100V for street photography (compact, excellent quality), a Sony A7RIVa for high resolution work (including wild life; a bit slow though, landscapes, portraits, specific subjects such as trains, cars, ships etc.) and now my S5ii for general photography (family, portraits and video etc.). I have ended up here as a result of much experimentation and find each body/lens combination has its own merits and have struggled to find a one size fits all solution. Just a thought and maybe worth the time to ponder. (The Z8 might have replaced the Sony A7RIVa and Panasonic S5ii for me except I do not get on with Nikons and it is still too large).
BTW I love this discussion and thank this forum for providing a suitable location for this debate.