fyi
This is only speculation at this stage (verging into clickbait), but he's probably correct on most of these points IMHO. Exceptions being many of the same individuals will still own multiple cameras.
Above all, high quality images in lowlight is still the key question - so Thom's Point #1 is still the proverbial pachyderm in the outdoor studio. My planning to get a D5 (D6) is for decent IQ @ ISO12 800 in the gloaming, and even 256 000 (with NR in post)
"... Rumors—and not just about the upcoming Sony A9 iteration—seem to indicate that the days of low pixel count but high speed are nearing an end. Nikon's upcoming high-end mirrorless camera is also rumored to be a high pixel count camera. Meanwhile, the recent Canon R5 will happily fire away its 45mp at 20 fps. ..."
Something changed in the top level camera designs
sansmirror.com