I don't want to discount his column, but Kai isn't exactly impartial here given that he is a big camera retailer, and is always looking to drive traffic to his site with some controversial comments/videos. His videos are pretty entertaining, and he isn't necessarily wrong with what he says, but as others have pointed out, there is a bigger picture if you're an established company. As fans, we always want more, but as he's pointing out with the Nikon Df, bad decisions can be costly. I'd rather have solid, less exciting products from a company that will still be in business 10+ years from now, than bleeding edge buggy gear (read Blackmagic) from a company that may or may not survive a dud product. What the big guys like to do is to let the smaller, more agile guys (read Blackmagic, again) take the risks and push them (the big guys) to innovate while keeping their stability.
Yes, that sounds boring, but if you look at the 5DIII and Magic Lantern, it looks like Canon's giving the customers the best of both worlds.