@rcombs this isn't really the appropriate format to try and summarize 3 years of learning about this in the field, working with probably some of the foremost experts in the field. I also likely will get into NDA things pretty quickly with more details.
Those experts are people I recognize in the list of authors of the proposal. They're people that have spent their whole career working on protecting users from data theft / impersonation. I personally trust that they have done their homework.
@rcombs another angle: do you think those people don't know how bad such a proposal looks, especially coming from Google? Look at the list of non-goals, the number of counter-measures they propose to avoid this being too abusable, etc. They clearly understand your viewpoint as well, to some extent.
And yet they still thought it would be a good move to publish this proposal. Do you think they would have done so if "this ain't gonna solve that case" (or rather: "help", you can't "solve" abuse)?