I hope he's wrong, because I hope Google wasn't so stupid.
My usage patterns/goals/content/etc on G+ are nothing like they are with {my new RSS reader}. In fact, I'm looking at unsubscribing from all but my smallest communities because the big linux distro and android based communities are overrun with individuals spamming religious, political, and just random personal images in them.
(edit, oh and Adiós!, apparently!)