kiwifidget:
100 years from now, your descendants trying to work out their family tree will be very grateful you completed a census.
I can't say I care about that at all. I'd still rather use the time for any other things. Besides which - isn't it supposed to be anonymous with uber-awesome privacy. How will my distant ancestors trace me if that is the case.
The census is not required for family tree mapping exercise. There is a birth certificate and one day will be a death certificate bearing my name. Another example of the redundancy of aspects of the mighty census.