I feel like it is the necessary and unavoidable next step for them, logistically-speaking, if they are trying to re-organize the company around Google Plus, which they are trying to integrate across all of their services, from apps to search.
I like that they are being upfront about it, instead of changing it behind your back, like Facebook often does.
“In short, we’ll treat you as a single user across all our products, which will mean a simpler, more intuitive Google experience,” said Alma Whitten, Google’s director of privacy for product and engineering.
While I might not like it, I am not going to be disabling my account, and I want to see 66% of people do it. No matter where they go, they'll be tracked sooner or later. These are the same people who check themselves in on Facebook and foursquare.
The only thing I don't like is that even though I never signed up for and never wanted to register on YouTube, they still incorporated Google account into it. On top of it, they keep user history of videos watched. There has got to be an option somewhere that allows you to stop that, but I haven't found it yet.