I suspect Google will eventually use G+ to power Google Now. You could ask your phone for movie recommendations and it will reply with a curated list based on what movies or youtube trailers your G+ friends have seen.
Now that social networks have supplanted personal webpages/blogs and small independent sites are dying from inactivity Google has less and less to crawl. They need G+ to power their mobile search (Google Now) and make their results personal, it might not make money on its own but they can't kill it, it's their long term lifeline - it might completely change over time, but it'll be a gradual evolution not a restart.
Googe+ has a nice communities feature that i like.
https://plus.google.com/commun...
People can subscribe to page dedicated to a topic they like and post to the page.
G+ is centered around your interests, not your high-school friends. This data is more valuable to Google.
If you won't post something to G+ with your real name chances are you shouldn't be posting it. It reduces the amount of "keyboard warriors" on the site and increases the value of the data. yes i know there are legitimate reasons for anonymity, but in these situations G+ isn't your best outlet.
The people against Google's single sign in policy are misguided, Google can create a standard sign in form for all their services and make you sign up to each one. Or you can fill out one form and use the services you like. It's the same thing.