No he is arguing that because Google closed down Reader, using any other service offered by Google is poor judgement while also stating that they don't innovate in many if not all product areas.
I can't read that from the original comment. In fact, he didn't even mention Google Reader specifically.
If you are referring to the original article, the article makes it fairly obvious that the GReader event was the proverbial last straw, not the main motivator.
Reducing your dependency on Google's support for open standards then becomes prudent.
Personally I'm sticking with a number of Google services, but I'm also taking precautions (backing up my data; my primary address is on my own domain so I can move away from Gmail easily if I want to (don't think they'd close it down, but they certainly can - and have - made changes that I find detrimental; I only stick with Gmail now because of a number of tweaks using Minimalist, for example)
It's not so much that Google has become horrible, but that they've taken a number of steps to be "less good" than what a lot of people have come to expect and depend on. They're on their way to being "just another company" instead of anything special.