If I understand you correctly, are you saying that there was some coordinated effort to lower birth rates over the last 40 years? What would the point of this be?
According to most sociologists, the lowering birth rate seems to be an effect of higher incomes and education, and is affecting most first world countries, not just Canada.
I think I agree with you, however, that wages in general should go up at the expense of the super-wealthy elites.
Is China's reduction in birth rate caused by the same thing? Or Germany's? I'm just saying, this seems to be a phenomenon of wealth and prosperity, not any specific coordinated effort.
As for multiculturalism... My opinion there is it's all relative. Technically the land belongs to the native Americans. Europeans are the new culture.
Interestingly, the majority of Canada's new incoming non permanent immigrants appear to be from Ukrainian, another European country, to escape the war.