Serious question, what are you outputting that requires 80-100mp? I’m seriously interested in peoples use case for this type of camera.
If it’s prints what size and how many are you doing a year, if it’s wildlife for cropping what focal length do you normally use, that kind of thing.
I'm primarily a hobby landscape photographer and the vast majority of my use is for personal consumption, with limited sales of calendars, prints, and the odd paid job. My desire for more resolution is linked to me really liking (and wanting to produce) high detail metal prints to be viewed from close.
I often perform a bit of cropping for the sake of composition, but not usually anything crazy. It's not uncommon for me to sacrifice maybe 30% of the resolution depending on the situation. I'm currently shooting with a 5D IV and finding typical crops are not providing sufficient resolution for 20x30 inch metal prints (at the distance they're viewed from) which is a pretty common size for me. An R5 is likely plenty for that size, but I've got a few panoramas at 6 feet long which I absolutely love. Those are often north of 90mp.
My intent with a camera like this is to produce high detailed prints at maybe ~48 inches long by 38 wide, again, to be viewed from close (i.e. in a hallway). 100 is definitely more than I need and even 80 is likely high, but I could personally justify more than 45. I don't need high burst rates or any video really, so the biggest gap I currently have in my equipment is resolution (and autofocus for those odd paid jobs to be fair).
With all that said, my biggest concern with that much resolution is diffraction limited aperture. I'd anticipate being diffraction limited at most apertures I'd be shooting at, so I'm not sure that I'd get the full resolution I'd be after all the time anyway. I'm in no rush to buy so I'm content to wait until it's available and judge for myself or take it out as a rental and see if it suits my needs as intended.