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Google+ doesn't seem to be providing an RSS feed of G+ posts on your public profile, it looks like it's providing a feed of your Buzz public posts instead.  In general there seems to be a decline in blogging combined with less use of RSS readers (and less provision of RSS feeds).  I think this is an unfortunate degradation of a distributed content ecosystem that was working well.  Obviously it is in the interests of pretty much all the corporations to centralise content, to have you live "inside" Facebook, Google, Quora, Twitter, LinkedIn, Flickr or whatever particular content garden the corporation provides.

If this continues along the current track, Facebook will know everything about your relationships and the history of their evolution, as well as all of your personal interests, Twitter will know everyone you share work links with and the topics that you discuss and follow, LinkedIn will know your entire work history and all your work connections, and Google will contain mostly everything else related to your professional life as well as (for some people) aspects of your personal life.  This is the inverse of the original content model, in which you produce content on many many different sites that have no direct interconnections (thus necessitating sites like FriendFeed to aggregate it all back together).  Your photo self is separate from your work blogging self is separate from... etc.  Now instead it appears we are being pushed to, on our own time, wrap up our entire selves in a nice incredibly-detailed demographic package for corporations.  How nice of us.