You say there are many users like yourself who want a pure stills camera. How many? See, that's the problem. Not enough.
In my opinion camera makers are underestimating the number. One thing is for sure: it is way larger than number of folks really needing 8k video in a non-video camera today.
Yes, I got a 5D3 and yes, it has video. Not because I wanted it, but depite of it. It was forced down my throat. And yes, I do regret my purchase of 5D3 and f/2.8 EF L zooms. While IQ is fine, AF is not to my taste (no face/eye detect, still gives me shots focused on fence in background rather than on faces in foreground) and most importantly: too big , too heavy, too expensive, too cumbersome for most of my use, most of the time. That's why my 5D3 and L glass are only used for planned shoots and locked in a closet 99,99% of the time, while my EOS M and EF-M are almost always along with me.
I still believe fully capable, affordable and super-compact mirrorfree FF stills-optimized cameras will eventually come. Sized just a tad bigger than Sigma fp to include built-in pop-up EVF and a good power pack. Sensor 35-45 MP, 8 fps, really intelligent AF (face, eye, subject tracking), excellent EVF, priced at 1499, max. 1999. Plus matching lenses sized and priced around where the new Samyang AF lineup is.
Currently camera makers are in the same phase like car manufacturers in the 1970s: only BIG cars. Things changed. a lot. Now there is ample choice of small, fully capable cars as well. I do hope the current crisis and its economic aftermath over the next 2-3 years will bring camera makers first to their knees and then to their senses. One R5 is fine, no problem. But what's sorely missing are *really decent, really compact, really affordable* cameras and lenses. 8k video? Not so much.
We shall see how things play out. In the meantime I'll capture some more stills images with my EOS M plus a few with my 5D3. Not in a hurry to spend money.
PS: Speaking of money: short term I am waiting for R5 price to become known. It might be a fun moment, for me.