You make a fair point.His argument can be applied to every crop sensor camera line expect probably Fuji
That's going to be a much slower path. EF has been around for over 30 years, F mount for nearly 60 years. Those systems will not die easily or quickly, no matter what their makers do.yet has no problem recommending CaNikon FF DSLR cameras, which are most definitely on the way out once the mirrorless mounts are fully developed
From most accounts, the legacy adapters for the new Canon and Nikon mirrorless work exceptionally well with the lenses they support. Suspect that EF lenses will continue to be used and made long after Canon has stopped making EF cameras.