Persona isn't a panacea. If websites collude, and you use the same address on each site, then they'll be able to correlate their user tables.
That's identical to the status quo, and fixing it is not one of Persona's explicit goals.
We're very consciously trying to hit a pragmatic middle ground that moves the web closer to user empowerment, without being so different as to hinder adoption. Consider: if you're already collecting email addresses for your users, you can immediately start using Persona without changing any of your assumptions about your data model. It's portable and it dovetails into current practices.
However, it is technically possible to do what you want right now, so long as you have your own domain and write a small browser extension. Longer term, we're currently working with a partner on a possible extension to the provider protocol which would make it easier to implement that sort of "directed identity."
That's identical to the status quo, and fixing it is not one of Persona's explicit goals.
We're very consciously trying to hit a pragmatic middle ground that moves the web closer to user empowerment, without being so different as to hinder adoption. Consider: if you're already collecting email addresses for your users, you can immediately start using Persona without changing any of your assumptions about your data model. It's portable and it dovetails into current practices.
However, it is technically possible to do what you want right now, so long as you have your own domain and write a small browser extension. Longer term, we're currently working with a partner on a possible extension to the provider protocol which would make it easier to implement that sort of "directed identity."