it'll probably be like openid. a few big names will host a data for a large number of people that don't care to setup their own, but for those that want more control, they can host their own data.
even if those non-technical people don't host their own data, they'll be able to switch to something else that may have different privacy policies.
even if those non-technical people don't host their own data, they'll be able to switch to something else that may have different privacy policies.