I can only add that there has been an enormous range of concerns expressed, from banks to institutes of public policy, think tanks, health organizations, religious organizations, and I don't know how many of the major cities of the country. Something like 50 officially have taken a position on this issue. The list is long and encompasses almost every kind of user.
The census is the single most widely used... It's not just for research, but for decision-making, for evidence by businesses that want to locate outlets or to locate plants. They need to know what their potential labour force is or what their client groups are, and that's by small area, typically.
It's an enormously widely used information source. That's why I agree with Mr. Smith that the only thing we can know is that the risk of bias will increase substantially. We can't say that it will be biased, but without testing, it shouldn't have been sprung, given the wide use of the data in this country.