Canada

The academic literature overwhelmingly finds that the level of immigration has a negligible or neutral overall impact on indicators that determine a country’s living standards: labour productivity, real wages, the employment rate, the population’s age structure and, crucially, GDP per capita.

Who ever said immigrations goal was short term immediate benefit?

Also I don't think this is true. I've always seen studies that show how immigrant's by the second generation are indistinguishable from third born and greater Canadians. But even better, they're job creators and often higher educated since immigrants value higher education more than natural born Canadians. The thing about higher education is it creates more economic stability during difficult economic times.

Some examples:

The second generation’s business ownership rates were lower than that of immigrants but higher than those of third plus generations—individuals with Canadian-born parents. This finding held for all three forms of business ownership investigated in this study: the ownership of (1) private incorporated firms with employees, (2) private incorporated firms in high-tech research and development (R&D)-intensive industries and (3) the primary self-employed (unincorporated).

https://www150.statcan.gc.ca/n1/pub/36-28-0001/2021009/article/00003-eng.htm

immigrants who came to Canada as children participated in postsecondary education more often than the Canadian population as a whole, with those admitted at younger ages participating the most. Also, children admitted as economic immigrants fared better than the overall Canadian average from age 25 on. Then by age 30, children of sponsored and refugee families had median wages comparable to the overall population. These results were similar to what Stats Can found in a study for the 2018 tax year.

https://www.cicnews.com/2022/02/immigrant-children-become-more-educated-and-higher-paid-than-canadian-average-study-0221762.html#gs.52u4pn

Canadians stopped having kids. Long before any economic struggle. Immigrants are just new tax payers. They're not short term solution they're a long term solution. Otherwise we just don't have the tax base to support Canada. Housing can and is being fixed. But we can't fix the dwindling tax base whenever we feel like. It had to start 20 years ago