Not just Social Security - all security...
There is an interesting paper on this at http://www.epinet.org/content.cfm/briefingpapers_bp129
Basically, a LOT of people are going to be depending on the Social Security 'minimum benefit' - the same one that the Republican greed jihad wants to eliminate, surprise suprise..
Lots more papers analyzing various aspects of this huge money grab at
http://www.epinet.org/content.cfm/issueguides_socialsecurity_socialsec
http;//www.ctj.org and others..