I'd be more concerned when they start forcing G+ on open platforms like the Web and Android. Maybe it's already started with Android KitKat shipping with Hangouts as the default messaging app.
When will this madness stop?
http://android-developers.blogspot.com/2013/10/getting-your-...
Intercepting SMS required using a hidden API before. Now it's an officially supported feature.
No conspiracy theories necessary. :)