Only if immigrants are merely settling empty land. As long as they want to start out as part of society, they'll need jobs, housing and regular infrastructure. My own region is growing nearly as fast as housing can be built. More than 50% of everyone in some cities like Toronto have been in the country for less than 5 years, at any given moment. (Often starting out there, and moving to other parts of Canada later. Still limited by the population capacity of Toronto)

Uh, I guess? It looks like you're making fun of your own original argument at this point. In this case, if you use these numbers as an indicator of demand the UK clearly has greater demand per capita. And per capita is a much better measure since a country with a bigger population can assimilate and/or integrate a larger number of immigrants, thus it can comfortably have a larger immigration demand than a smaller country.