OK I'm going to continue being a nice guy and meet you half way. A census once every 50 years is probably acceptable just make sure the info is on track.
I disagree. Take the period from 1950-2000. If you're a researcher using 1950 census data in the 1990's, well you don't have any data after AIDS became known, so you can't do any kind of epidemiological work to identify trends in the most at risk groups. You can't even formulate a plan of action on how to best manage the disease.
All the information that will be gleaned from a census, the gov't already has.
No, they really don't. Which government database will have the percentage of homeowners and tenants in your area? The Census will. see, it's the Census which obtains the information that the government departments have. If you drop the census, then you don't have government departments with all of the detailed information contained in the census.
The know how many people there were at the time of the last census - they have birth, death, immigration and emmigration records since, so it's a simple matter of adding and subtraction.
The "government" includes municipal, provincial, and federal levels of bureaucracy. The census information is not easily stitched together from multiple levels of government.
As far as the demographics go, there is a record of everyone over 65 because they receive a gov't cheque every month.
And anyone who pays taxes. But the number of pensioners collecting a cheque doesn't tell the full story of the over 65 group. There are some which don't collect a cheque. Some maybe working still. If you want a more complete picture, you need a census. That is what a census is meant for. In fact, it would be more expensive to pay people to collect and collate this information than it is to collect the census.
Everyone in school, university, hospital or in prison is a matter of Gov't record.
Right, but again these aren't complete pictures. How far do the students in your district have to travel to get to school? Are university students using public transit, or driving?
And again, these are different levels of government.
Why do you want to make it more difficult? The census is easy.
And just so we're clear, what is your position on the actual topic of this thread? Do you favour poor quality data as Scott Free does? Because that's what is going to happen. So the merits of no census or a census are really ancillary, as the actual choice here is good quality data, or poor quality data.