Sadly, I could imagine it won't be built, or not soon, but things do change; people make change.

I think govermnment and tech leaders greatly underestimate demand for privacy (confidentiality). People in polls consistently say they are worried about government and corporate surveillance and want privacy; you can see the response to Flock cameras right now. Apple, the most successful computer company, clearly sees demand for it, devotes extensive engineering to it, and markets products on that basis. People in other places (e.g., the EU) have passed laws with much greater privacy protection.

The public doesn't understand what's happening - how they are tracked (e.g., all electronic monetary transactions) and what the power/impact of that surveillance is - and they are givin no path forward but to submit. When they have a path (again, Flock, Apple, other countries), they take it. They need tech people to take the lead, educate people in plain English (not 'PKI', etc.), and develop options technical and political - politicians generally are non-technical too.

The solutions require both legal and technical components. With no technical limitation - if data is open on the laptops of everyone in the legal / finance / national security communities - the legal constraints won't work; people will use the data anyway. If there is no legal restriction, they'll obtain access anyway.