I think Google is shooting themselves in the foot with this strategy.
Stop trying to make Google+ happen. It's not going to happen. Karim is reacting specifically to Google's integration of YouTube comments with Google+, a change made on Thursday. You now must have a Google+ account in order to comment on a YouTube video.
LINK: http://www.huffingtonpost.com/2013/11/08/youtube-founder-google_n_4241492.html