"I am fairly sure that nothing like that is going to happen in the USA or UK anytime soon, but be careful what you wish for eh???
Food for thought."
3 points you might like to keep in mind.
The last 2 UK censuses were not down to the "house" level, but the individual person.
The data was processed by a subsidiary of Lockheed Martin, so would be subject to THE PATRIOT Act.
The data is neutral. But once it's collected what are the limits on what it's used for?