That's not at all what happened in Nikon. Shipment volume is down double digits for Nikon for the last two years, primarily because of the restructuring. It had nothing to do with mount and eye AF, obviously. This year's sales value for Nikon was off 28.5%, which would be after any possible mount issue.That is the position Sony is in now.
Nikon shot themselves in the foot when AF came of age and refused to give up on the old antiquated mount and just kept trying to patch things on to it. They have never recovered from that big mistake.
Canon with the RF mount kept all the features of the EF so owners don't get screwed where the Nikon Z mount leaves a lot of the dozen different F mount variants in the cold except for the latest few.
Again, financial news of companies need financial sources. You can't make up facts about a company's fiscal health because you do or not like feature X of a camera.
The D850 bounce is done, but their logistics and chip issues, which were key in driving them into the red, are better but still in bad shape. Nikon's blamed the earthquake for too long, manufacturing and logistics operating at the level of a third rate company is killing them and completely inexcusable. The recall makes it clear that they STILL haven't been able to increase quality assurance to keep pace with lagging manufacturing ramping.
Ushida and Umatate should have gone away, not up.