His claims can be summed up as "amateurs value connectivity more than image quality"
And that's why he's wrong. We should also "amateurs" - what it really means.
Non professional photographers take images for very different reasons. And not all of them - and probably just a small part of them, although very visible due to the hype sorrounding "social media" today - require "instant connectivity". While there amateurs who value image quality a lot. We all agree that P&S market is already doomed - but even here you can find people needing a small, light camera yet versatile and delivering high image quality. A niche market, probably, but not a so small niche. But people approaching DSLR and their systems? Sure, there is the "gear collector" for whom the "feature set" printed on the box is of paramount importance. But those really interested in photographic art and technique, and looking for quality and versatility? Why their cameras shoud be turned into smartphones wannabe, when what you need while shooting is less distractions? Do you really need in-camera notifications of how many likes and retweets your last photo got? Do you shoot just to please your ego, or do you have other reasons?
Even among professional there could be some who could value today connectivity much more then image quality i.e. paparazzi and sport/photojpurnalists, while others don't.
If that was his thought, well, he's using "amateurs" in the negative meaning many "pros" use. But is this really the target market, or maybe some camera maker has a better understanding of their market and what user really want? While user feedback is important to design a product, following only user feedback is not really the way to design a good product. Apple has been successful in the past years exaclty because was able to find good designs most users would have never thought about. When Canon asked Colani a new design for camera bodies, he delivered a new ergonomic design that became the de-facto industry standard, still in use today. Would users have ever asked for that? I really doubt it. Probably, they would have asked for some bells and whistles, thinking "out of the box" is something much more difficult, and it's not usually achieved just chasing fashions.
And sometimes fashion is wrong. On my previous smartphones (I got my first one in 2002... - said it was the future, people wandered how could I use such a large phone...) I could answer a call pressing a single button, while not even looking at the device. Now most buttons went way, and answering a call requires - a swipe, and a "touch" - and of course you have to look at the phone. Of course, calling/answering is now out of fashion. You should just take images and upload them.
PS: I know I can answer with a single button press on a bluetooth device - just I don't wear one all the time...