The only way I see it as good for them is if that 100 million are Canadians and not any type of foreign national.(although I rather take the western part of Canada in the name of the land of the free)
Depends by what means. Rather then just increase immigration and hand over the country to waves of immigrants from all around the world, why not try and implement other measures including increasing the national birthrate (whether that be through tax breaks, subsidized housing or another form of financial incentive and assistance). This could especially help families in rural communities where the population decline has been the most severe.
While a declining native population is a big problem, another problem as Shirvan himself pointed out in the video is the population distribution which mainly resides to the south by the border. The new batch of immigrants that have been arriving in the last years, also typically move in to the large cities like Ontario and Vancouver. Even if you were to bring in more immigrants, the government would have to do a better job in encouraging these new immigrants to move in to areas like the Prairie provinces which are closer to the more developed areas of Canada's Arctic territories.
well if they do the Immigrants will have to integrate, and to do that they have to be at the very least similar to the natives. otherwise they will create their own culture among themselves due to inherent tribalism. however seeing as the kind of government Canada has. These new immigrants will be swarms of Chinese, africana, and middle easterners who will definitely no integrate.
That means flooding Tens of Millions of Non-whites into Canada to outnumber the White Population of Canada.
Canada cannot support 100 million people.