That is a long list of assumptions you've made there. Burst speeds and autofocus mean very little to me, since I mostly shoot manual tilt shift lenses and do architecture and landscapes.
I print. Very. Large. Formats. Huge ones actually. I've sold multiple photo wallpapers just this year, not to mention many framed prints. If I'm printing a 40 ft wide photo wallpaper for a public space, then I really DO need those megapixels because people will come up to them and see the image quality - not just me on 400% zoom. Just the other day I completed editing on a 27 gigabyte photo that has a 130,000 pixel width and can be printed at 300 dpi to 30 feet wide.
I can't remember the last time I needed 1/4000s shutter speed.
Finally, it's not just the resolution, but also the dynamic range. While the R5 was a big step forward compared to 5D series cameras, it's still behind the medium format.
Because I will adapt some of my Canon TSE lenses, I will also profit from the extra width of the medium format frame, meaning I won't have to stitch as often as I do now.
And finally, I will still keep my Canon R5 and a full set of lenses; might even get the R5mkII as a backup and as a video camera for the shorts and reels that I occasionally do for my clients. But instead of pouring more money into a Canon system, I will be adding the Fuji GFX - not because I want to, but because Canon doesn't have and will not have for god knows how many years, a sensor that I need.