I disagree. Facebook connect, google+ sing on, sign on with Twitter, and username / password reuse all demonstrate the demand from 'normal' users for a SSO solu

I disagree. Facebook connect, google+ sing on, sign on with Twitter, and username / password reuse all demonstrate the demand from 'normal' users for a SSO solution. There is also a distrust of these companies and the lock they have on your data so I believe there is room for an SSO solution that doesn't leak private info. Unfortunately for Persona a simple, fast, convenient user experience is not optional and that is where Persona has failed. I also believe getting to a great UX will be difficult or impossible with the decentralized system currently behind persona.